diff --git a/README.md b/README.md
index a08df00..00c254a 100644
--- a/README.md
+++ b/README.md
@@ -383,6 +383,42 @@ The currency code has two different formats `ALPHA` or `NUMERIC`. Select the for
 
 If `strict` is `true`, the code must be passed in uppercase. Otherwise, the case doesn't matter.
 
+### Language Tag (BCP 47)
+
+The field under validation must be a valid IETF language tag according to BCP 47 standard.
+
+    public Intervention\Validation\Rules\LanguageTag::__construct(string $delimiter = '-', bool $allowScript = false, bool $allowRegion = true, bool $allowVariants = false, bool $allowExtensions = false, bool $allowPrivateUse = false, bool $strict = true)
+
+#### Parameters
+
+**delimiter**
+
+Define the delimiter used for validation. Default `-`.
+
+**allowScript**
+
+Specify whether the script subtag is allowed during validation. Default `false.`
+
+**allowRegion**
+
+Specify whether the region subtag is allowed during validation. Default `true.`
+
+**allowVariants**
+
+Specify whether variant subtags are allowed during validation. Default `false.`
+
+**allowExtensions**
+
+Specify whether extension subtags are allowed during validation. Default `false.`
+
+**allowPrivateUse**
+
+Specify whether private use subtags are allowed during validation. Default `false.`
+
+**strict**
+
+If `strict` is `true`, the subtags must be in the correct case. Otherwise, the case doesn't matter. Default `true`.
+
 ## Development & Testing
 
 With this package comes a Docker image to build a test suite container. To
diff --git a/src/Rules/CountryCode.php b/src/Rules/CountryCode.php
index 2a7bad5..d3880b9 100644
--- a/src/Rules/CountryCode.php
+++ b/src/Rules/CountryCode.php
@@ -5,71 +5,17 @@
 namespace Intervention\Validation\Rules;
 
 use Intervention\Validation\AbstractRule;
+use Intervention\Validation\Traits\HasCountryCodeValues;
 use InvalidArgumentException;
 
 class CountryCode extends AbstractRule
 {
+    use HasCountryCodeValues;
+
     public const ALPHA2 = 'alpha2';
     public const ALPHA3 = 'alpha3';
     public const NUMERIC = 'numeric';
 
-    private const VALUES = [
-        self::ALPHA2 => [
-            'AD', 'AE', 'AF', 'AG', 'AI', 'AL', 'AM', 'AO', 'AQ', 'AR', 'AS', 'AT', 'AU', 'AW', 'AX', 'AZ', 'BA', 'BB',
-            'BD', 'BE', 'BF', 'BG', 'BH', 'BI', 'BJ', 'BL', 'BM', 'BN', 'BO', 'BQ', 'BR', 'BS', 'BT', 'BV', 'BW', 'BY',
-            'BZ', 'CA', 'CC', 'CD', 'CF', 'CG', 'CH', 'CI', 'CK', 'CL', 'CM', 'CN', 'CO', 'CR', 'CU', 'CV', 'CW', 'CX',
-            'CY', 'CZ', 'DE', 'DJ', 'DK', 'DM', 'DO', 'DZ', 'EC', 'EE', 'EG', 'EH', 'ER', 'ES', 'ET', 'FI', 'FJ', 'FK',
-            'FM', 'FO', 'FR', 'GA', 'GB', 'GD', 'GE', 'GF', 'GG', 'GH', 'GI', 'GL', 'GM', 'GN', 'GP', 'GQ', 'GR', 'GS',
-            'GT', 'GU', 'GW', 'GY', 'HK', 'HM', 'HN', 'HR', 'HT', 'HU', 'ID', 'IE', 'IL', 'IM', 'IN', 'IO', 'IQ', 'IR',
-            'IS', 'IT', 'JE', 'JM', 'JO', 'JP', 'KE', 'KG', 'KH', 'KI', 'KM', 'KN', 'KP', 'KR', 'KW', 'KY', 'KZ', 'LA',
-            'LB', 'LC', 'LI', 'LK', 'LR', 'LS', 'LT', 'LU', 'LV', 'LY', 'MA', 'MC', 'MD', 'ME', 'MF', 'MG', 'MH', 'MK',
-            'ML', 'MM', 'MN', 'MO', 'MP', 'MQ', 'MR', 'MS', 'MT', 'MU', 'MV', 'MW', 'MX', 'MY', 'MZ', 'NA', 'NC', 'NE',
-            'NF', 'NG', 'NI', 'NL', 'NO', 'NP', 'NR', 'NU', 'NZ', 'OM', 'PA', 'PE', 'PF', 'PG', 'PH', 'PK', 'PL', 'PM',
-            'PN', 'PR', 'PS', 'PT', 'PW', 'PY', 'QA', 'RE', 'RO', 'RS', 'RU', 'RW', 'SA', 'SB', 'SC', 'SD', 'SE', 'SG',
-            'SH', 'SI', 'SJ', 'SK', 'SL', 'SM', 'SN', 'SO', 'SR', 'SS', 'ST', 'SV', 'SX', 'SY', 'SZ', 'TC', 'TD', 'TF',
-            'TG', 'TH', 'TJ', 'TK', 'TL', 'TM', 'TN', 'TO', 'TR', 'TT', 'TV', 'TW', 'TZ', 'UA', 'UG', 'UM', 'US', 'UY',
-            'UZ', 'VA', 'VC', 'VE', 'VG', 'VI', 'VN', 'VU', 'WF', 'WS', 'YE', 'YT', 'ZA', 'ZM', 'ZW',
-        ],
-        self::ALPHA3 => [
-            'AFG', 'ALB', 'DZA', 'ASM', 'AND', 'AGO', 'AIA', 'ATA', 'ATG', 'ARG', 'ARM', 'ABW', 'AUS', 'AUT', 'AZE',
-            'BHS', 'BHR', 'BGD', 'BRB', 'BLR', 'BEL', 'BLZ', 'BEN', 'BMU', 'BTN', 'BOL', 'BES', 'BIH', 'BWA', 'BVT',
-            'BRA', 'IOT', 'BRN', 'BGR', 'BFA', 'BDI', 'CPV', 'KHM', 'CMR', 'CAN', 'CYM', 'CAF', 'TCD', 'CHL', 'CHN',
-            'CXR', 'CCK', 'COL', 'COM', 'COD', 'COG', 'COK', 'CRI', 'HRV', 'CUB', 'CUW', 'CYP', 'CZE', 'CIV', 'DNK',
-            'DJI', 'DMA', 'DOM', 'ECU', 'EGY', 'SLV', 'GNQ', 'ERI', 'EST', 'SWZ', 'ETH', 'FLK', 'FRO', 'FJI', 'FIN',
-            'FRA', 'GUF', 'PYF', 'ATF', 'GAB', 'GMB', 'GEO', 'DEU', 'GHA', 'GIB', 'GRC', 'GRL', 'GRD', 'GLP', 'GUM',
-            'GTM', 'GGY', 'GIN', 'GNB', 'GUY', 'HTI', 'HMD', 'VAT', 'HND', 'HKG', 'HUN', 'ISL', 'IND', 'IDN', 'IRN',
-            'IRQ', 'IRL', 'IMN', 'ISR', 'ITA', 'JAM', 'JPN', 'JEY', 'JOR', 'KAZ', 'KEN', 'KIR', 'PRK', 'KOR', 'KWT',
-            'KGZ', 'LAO', 'LVA', 'LBN', 'LSO', 'LBR', 'LBY', 'LIE', 'LTU', 'LUX', 'MAC', 'MDG', 'MWI', 'MYS', 'MDV',
-            'MLI', 'MLT', 'MHL', 'MTQ', 'MRT', 'MUS', 'MYT', 'MEX', 'FSM', 'MDA', 'MCO', 'MNG', 'MNE', 'MSR', 'MAR',
-            'MOZ', 'MMR', 'NAM', 'NRU', 'NPL', 'NLD', 'NCL', 'NZL', 'NIC', 'NER', 'NGA', 'NIU', 'NFK', 'MKD', 'MNP',
-            'NOR', 'OMN', 'PAK', 'PLW', 'PSE', 'PAN', 'PNG', 'PRY', 'PER', 'PHL', 'PCN', 'POL', 'PRT', 'PRI', 'QAT',
-            'ROU', 'RUS', 'RWA', 'REU', 'BLM', 'SHN', 'KNA', 'LCA', 'MAF', 'SPM', 'VCT', 'WSM', 'SMR', 'STP', 'SAU',
-            'SEN', 'SRB', 'SYC', 'SLE', 'SGP', 'SXM', 'SVK', 'SVN', 'SLB', 'SOM', 'ZAF', 'SGS', 'SSD', 'ESP', 'LKA',
-            'SDN', 'SUR', 'SJM', 'SWE', 'CHE', 'SYR', 'TWN', 'TJK', 'TZA', 'THA', 'TLS', 'TGO', 'TKL', 'TON', 'TTO',
-            'TUN', 'TKM', 'TCA', 'TUV', 'TUR', 'UGA', 'UKR', 'ARE', 'GBR', 'UMI', 'USA', 'URY', 'UZB', 'VUT', 'VEN',
-            'VNM', 'VGB', 'VIR', 'WLF', 'ESH', 'YEM', 'ZMB', 'ZWE', 'ALA',
-        ],
-        self::NUMERIC => [
-            '004', '008', '010', '012', '016', '020', '024', '028', '031', '032', '036', '040', '044', '048', '050',
-            '051', '052', '056', '060', '072', '074', '076', '084', '086', '090', '092', '096', '100', '104', '108',
-            '112', '116', '120', '124', '132', '136', '140', '144', '148', '152', '156', '158', '162', '166', '170',
-            '174', '175', '178', '180', '184', '188', '191', '192', '196', '203', '204', '208', '212', '214', '218',
-            '222', '226', '231', '232', '233', '234', '238', '239', '242', '246', '248', '250', '254', '258', '260',
-            '262', '266', '268', '270', '275', '276', '288', '292', '296', '300', '304', '308', '312', '316', '320',
-            '324', '328', '332', '334', '336', '340', '344', '348', '352', '356', '360', '364', '368', '372', '376',
-            '380', '384', '388', '392', '398', '400', '404', '408', '410', '414', '417', '418', '422', '426', '428',
-            '430', '434', '438', '440', '442', '446', '450', '454', '458', '462', '466', '470', '474', '478', '480',
-            '484', '492', '496', '498', '499', '500', '504', '508', '512', '516', '520', '524', '528', '531', '533',
-            '534', '535', '540', '548', '554', '558', '562', '566', '570', '574', '578', '580', '581', '583', '584',
-            '585', '586', '591', '598', '600', '604', '608', '612', '616', '620', '624', '626', '630', '634', '638',
-            '642', '643', '646', '652', '654', '659', '660', '662', '663', '666', '670', '674', '678', '682', '686',
-            '688', '690', '694', '702', '703', '704', '705', '706', '710', '716', '724', '728', '729', '732', '740',
-            '744', '748', '752', '756', '760', '762', '764', '768', '772', '776', '780', '784', '788', '792', '795',
-            '796', '798', '800', '804', '807', '818', '826', '831', '832', '833', '834', '840', '850', '854', '858',
-            '860', '862', '876', '882', '887', '894', '064', '068', '070',
-        ],
-    ];
-
     /**
      * @throws InvalidArgumentException
      */
@@ -93,6 +39,6 @@ public function isValid(mixed $value): bool
             $value = strtoupper($value);
         }
 
-        return in_array($value, self::VALUES[$this->format], strict: true);
+        return in_array($value, self::$countryCodeValues[$this->format], strict: true);
     }
 }
diff --git a/src/Rules/LanguageCode.php b/src/Rules/LanguageCode.php
index 0ea1015..d1983a1 100644
--- a/src/Rules/LanguageCode.php
+++ b/src/Rules/LanguageCode.php
@@ -5,22 +5,11 @@
 namespace Intervention\Validation\Rules;
 
 use Intervention\Validation\AbstractRule;
+use Intervention\Validation\Traits\HasLanguageCodeValues;
 
 class LanguageCode extends AbstractRule
 {
-    private const VALUES = [
-        'aa', 'ab', 'ae', 'af', 'ak', 'am', 'an', 'ar', 'as', 'av', 'ay', 'az', 'ba', 'be', 'bg', 'bh', 'bi', 'bm',
-        'bn', 'bo', 'br', 'bs', 'ca', 'ce', 'ch', 'co', 'cr', 'cs', 'cu', 'cv', 'cy', 'da', 'de', 'dv', 'dz', 'ee',
-        'el', 'en', 'eo', 'es', 'et', 'eu', 'fa', 'ff', 'fi', 'fj', 'fo', 'fr', 'fy', 'ga', 'gd', 'gl', 'gn', 'gu',
-        'gv', 'ha', 'he', 'hi', 'ho', 'hr', 'ht', 'hu', 'hy', 'hz', 'ia', 'id', 'ie', 'ig', 'ii', 'ik', 'io', 'is',
-        'it', 'iu', 'ja', 'jv', 'ka', 'kg', 'ki', 'kj', 'kk', 'kl', 'km', 'kn', 'ko', 'kr', 'ks', 'ku', 'kv', 'kw',
-        'ky', 'la', 'lb', 'lg', 'li', 'ln', 'lo', 'lt', 'lu', 'lv', 'mg', 'mh', 'mi', 'mk', 'ml', 'mn', 'mr', 'ms',
-        'mt', 'my', 'na', 'nb', 'nd', 'ne', 'ng', 'nl', 'nn', 'no', 'nr', 'nv', 'ny', 'oc', 'oj', 'om', 'or', 'os',
-        'pa', 'pi', 'pl', 'ps', 'pt', 'qu', 'rm', 'rn', 'ro', 'ru', 'rw', 'sa', 'sc', 'sd', 'se', 'sg', 'si', 'sk',
-        'sl', 'sm', 'sn', 'so', 'sq', 'sr', 'ss', 'st', 'su', 'sv', 'sw', 'ta', 'te', 'tg', 'th', 'ti', 'tk', 'tl',
-        'tn', 'to', 'tr', 'ts', 'tt', 'tw', 'ty', 'ug', 'uk', 'ur', 'uz', 've', 'vi', 'vo', 'wa', 'wo', 'xh', 'yi',
-        'yo', 'za', 'zh', 'zu',
-    ];
+    use HasLanguageCodeValues;
 
     public function __construct(protected bool $strict = true)
     {
@@ -40,6 +29,6 @@ public function isValid(mixed $value): bool
             $value = strtolower($value);
         }
 
-        return in_array($value, self::VALUES, strict: true);
+        return in_array($value, self::$languageCodeValues, strict: true);
     }
 }
diff --git a/src/Rules/LanguageTag.php b/src/Rules/LanguageTag.php
new file mode 100644
index 0000000..9ddee5c
--- /dev/null
+++ b/src/Rules/LanguageTag.php
@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Intervention\Validation\Rules;
+
+use Intervention\Validation\AbstractRule;
+use Intervention\Validation\Traits\HasCountryCodeValues;
+use Intervention\Validation\Traits\HasLanguageCodeValues;
+
+class LanguageTag extends AbstractRule
+{
+    use HasLanguageCodeValues;
+    use HasCountryCodeValues;
+
+    public function __construct(
+        protected string $delimiter = '-',
+        protected bool $allowScript = false,
+        protected bool $allowRegion = true,
+        protected bool $allowVariants = false,
+        protected bool $allowExtensions = false,
+        protected bool $allowPrivateUse = false,
+        protected bool $strict = true,
+    ) {
+        //
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see Rule::isValid()
+     */
+    public function isValid(mixed $value): bool
+    {
+        $result = preg_match($this->pattern(), strval($value), $matches);
+
+        if ($result !== 1) {
+            return false;
+        }
+
+        $language = $matches['language'] ?? null;
+        $region = $matches['region'] ?? null;
+
+        $language = $language === '' ? null : $language;
+        $region = $region === '' ? null : $region;
+
+        if ($this->strict === false) {
+            $language = $language === null ? $language : strtolower($language);
+            $region = $region === null ? $region : strtoupper($region);
+        }
+
+        if (
+            $this->allowRegion === true &&
+            $region !== null &&
+            !in_array($region, self::$countryCodeValues['alpha2'], strict: true)
+        ) {
+            return false;
+        }
+
+        return in_array($language, self::$languageCodeValues, strict: true);
+    }
+
+    /**
+     * Build regex pattern according to parameters.
+     */
+    private function pattern(): string
+    {
+        $pattern = "/^";
+        $pattern .= "(?P<language>[a-z]{2})";
+
+        if ($this->allowScript === true) {
+            $pattern .= "(?:" . $this->delimiter . "(?<script>[A-Z][a-z]{3}))?";
+        }
+
+        if ($this->allowRegion === true) {
+            $pattern .= "(?:" . $this->delimiter . "(?<region>[A-Z]{2}))?";
+        }
+
+        if ($this->allowVariants === true) {
+            $pattern .= "(?:" . $this->delimiter . "(?<variants>[A-Za-z0-9]{5,8}|\d[A-Za-z0-9]{3}))*";
+        }
+
+        if ($this->allowExtensions === true) {
+            $pattern .= "(?:" . $this->delimiter . "(?<extensions>(?:[0-9A-WY-Za-wy-z])" .
+                "(?:" . $this->delimiter . "[A-Za-z0-9]{2,8})+))?";
+        }
+
+        if ($this->allowPrivateUse === true) {
+            $pattern .= "(?:" . $this->delimiter . "x(?<privateuse>(?:" . $this->delimiter . "[A-Za-z0-9]{1,8})+))?";
+        }
+
+        $pattern .= "$/";
+
+        if ($this->strict === false) {
+            $pattern .= "i";
+        }
+
+        return $pattern;
+    }
+}
diff --git a/src/Traits/HasCountryCodeValues.php b/src/Traits/HasCountryCodeValues.php
new file mode 100644
index 0000000..50c594f
--- /dev/null
+++ b/src/Traits/HasCountryCodeValues.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Intervention\Validation\Traits;
+
+trait HasCountryCodeValues
+{
+    /**
+     * @var array<array<string>>
+     */
+    protected static array $countryCodeValues = [
+        'alpha2' => [
+            'AD', 'AE', 'AF', 'AG', 'AI', 'AL', 'AM', 'AO', 'AQ', 'AR', 'AS', 'AT', 'AU', 'AW', 'AX', 'AZ', 'BA', 'BB',
+            'BD', 'BE', 'BF', 'BG', 'BH', 'BI', 'BJ', 'BL', 'BM', 'BN', 'BO', 'BQ', 'BR', 'BS', 'BT', 'BV', 'BW', 'BY',
+            'BZ', 'CA', 'CC', 'CD', 'CF', 'CG', 'CH', 'CI', 'CK', 'CL', 'CM', 'CN', 'CO', 'CR', 'CU', 'CV', 'CW', 'CX',
+            'CY', 'CZ', 'DE', 'DJ', 'DK', 'DM', 'DO', 'DZ', 'EC', 'EE', 'EG', 'EH', 'ER', 'ES', 'ET', 'FI', 'FJ', 'FK',
+            'FM', 'FO', 'FR', 'GA', 'GB', 'GD', 'GE', 'GF', 'GG', 'GH', 'GI', 'GL', 'GM', 'GN', 'GP', 'GQ', 'GR', 'GS',
+            'GT', 'GU', 'GW', 'GY', 'HK', 'HM', 'HN', 'HR', 'HT', 'HU', 'ID', 'IE', 'IL', 'IM', 'IN', 'IO', 'IQ', 'IR',
+            'IS', 'IT', 'JE', 'JM', 'JO', 'JP', 'KE', 'KG', 'KH', 'KI', 'KM', 'KN', 'KP', 'KR', 'KW', 'KY', 'KZ', 'LA',
+            'LB', 'LC', 'LI', 'LK', 'LR', 'LS', 'LT', 'LU', 'LV', 'LY', 'MA', 'MC', 'MD', 'ME', 'MF', 'MG', 'MH', 'MK',
+            'ML', 'MM', 'MN', 'MO', 'MP', 'MQ', 'MR', 'MS', 'MT', 'MU', 'MV', 'MW', 'MX', 'MY', 'MZ', 'NA', 'NC', 'NE',
+            'NF', 'NG', 'NI', 'NL', 'NO', 'NP', 'NR', 'NU', 'NZ', 'OM', 'PA', 'PE', 'PF', 'PG', 'PH', 'PK', 'PL', 'PM',
+            'PN', 'PR', 'PS', 'PT', 'PW', 'PY', 'QA', 'RE', 'RO', 'RS', 'RU', 'RW', 'SA', 'SB', 'SC', 'SD', 'SE', 'SG',
+            'SH', 'SI', 'SJ', 'SK', 'SL', 'SM', 'SN', 'SO', 'SR', 'SS', 'ST', 'SV', 'SX', 'SY', 'SZ', 'TC', 'TD', 'TF',
+            'TG', 'TH', 'TJ', 'TK', 'TL', 'TM', 'TN', 'TO', 'TR', 'TT', 'TV', 'TW', 'TZ', 'UA', 'UG', 'UM', 'US', 'UY',
+            'UZ', 'VA', 'VC', 'VE', 'VG', 'VI', 'VN', 'VU', 'WF', 'WS', 'YE', 'YT', 'ZA', 'ZM', 'ZW',
+        ],
+        'alpha3' => [
+            'AFG', 'ALB', 'DZA', 'ASM', 'AND', 'AGO', 'AIA', 'ATA', 'ATG', 'ARG', 'ARM', 'ABW', 'AUS', 'AUT', 'AZE',
+            'BHS', 'BHR', 'BGD', 'BRB', 'BLR', 'BEL', 'BLZ', 'BEN', 'BMU', 'BTN', 'BOL', 'BES', 'BIH', 'BWA', 'BVT',
+            'BRA', 'IOT', 'BRN', 'BGR', 'BFA', 'BDI', 'CPV', 'KHM', 'CMR', 'CAN', 'CYM', 'CAF', 'TCD', 'CHL', 'CHN',
+            'CXR', 'CCK', 'COL', 'COM', 'COD', 'COG', 'COK', 'CRI', 'HRV', 'CUB', 'CUW', 'CYP', 'CZE', 'CIV', 'DNK',
+            'DJI', 'DMA', 'DOM', 'ECU', 'EGY', 'SLV', 'GNQ', 'ERI', 'EST', 'SWZ', 'ETH', 'FLK', 'FRO', 'FJI', 'FIN',
+            'FRA', 'GUF', 'PYF', 'ATF', 'GAB', 'GMB', 'GEO', 'DEU', 'GHA', 'GIB', 'GRC', 'GRL', 'GRD', 'GLP', 'GUM',
+            'GTM', 'GGY', 'GIN', 'GNB', 'GUY', 'HTI', 'HMD', 'VAT', 'HND', 'HKG', 'HUN', 'ISL', 'IND', 'IDN', 'IRN',
+            'IRQ', 'IRL', 'IMN', 'ISR', 'ITA', 'JAM', 'JPN', 'JEY', 'JOR', 'KAZ', 'KEN', 'KIR', 'PRK', 'KOR', 'KWT',
+            'KGZ', 'LAO', 'LVA', 'LBN', 'LSO', 'LBR', 'LBY', 'LIE', 'LTU', 'LUX', 'MAC', 'MDG', 'MWI', 'MYS', 'MDV',
+            'MLI', 'MLT', 'MHL', 'MTQ', 'MRT', 'MUS', 'MYT', 'MEX', 'FSM', 'MDA', 'MCO', 'MNG', 'MNE', 'MSR', 'MAR',
+            'MOZ', 'MMR', 'NAM', 'NRU', 'NPL', 'NLD', 'NCL', 'NZL', 'NIC', 'NER', 'NGA', 'NIU', 'NFK', 'MKD', 'MNP',
+            'NOR', 'OMN', 'PAK', 'PLW', 'PSE', 'PAN', 'PNG', 'PRY', 'PER', 'PHL', 'PCN', 'POL', 'PRT', 'PRI', 'QAT',
+            'ROU', 'RUS', 'RWA', 'REU', 'BLM', 'SHN', 'KNA', 'LCA', 'MAF', 'SPM', 'VCT', 'WSM', 'SMR', 'STP', 'SAU',
+            'SEN', 'SRB', 'SYC', 'SLE', 'SGP', 'SXM', 'SVK', 'SVN', 'SLB', 'SOM', 'ZAF', 'SGS', 'SSD', 'ESP', 'LKA',
+            'SDN', 'SUR', 'SJM', 'SWE', 'CHE', 'SYR', 'TWN', 'TJK', 'TZA', 'THA', 'TLS', 'TGO', 'TKL', 'TON', 'TTO',
+            'TUN', 'TKM', 'TCA', 'TUV', 'TUR', 'UGA', 'UKR', 'ARE', 'GBR', 'UMI', 'USA', 'URY', 'UZB', 'VUT', 'VEN',
+            'VNM', 'VGB', 'VIR', 'WLF', 'ESH', 'YEM', 'ZMB', 'ZWE', 'ALA',
+        ],
+        'numeric' => [
+            '004', '008', '010', '012', '016', '020', '024', '028', '031', '032', '036', '040', '044', '048', '050',
+            '051', '052', '056', '060', '072', '074', '076', '084', '086', '090', '092', '096', '100', '104', '108',
+            '112', '116', '120', '124', '132', '136', '140', '144', '148', '152', '156', '158', '162', '166', '170',
+            '174', '175', '178', '180', '184', '188', '191', '192', '196', '203', '204', '208', '212', '214', '218',
+            '222', '226', '231', '232', '233', '234', '238', '239', '242', '246', '248', '250', '254', '258', '260',
+            '262', '266', '268', '270', '275', '276', '288', '292', '296', '300', '304', '308', '312', '316', '320',
+            '324', '328', '332', '334', '336', '340', '344', '348', '352', '356', '360', '364', '368', '372', '376',
+            '380', '384', '388', '392', '398', '400', '404', '408', '410', '414', '417', '418', '422', '426', '428',
+            '430', '434', '438', '440', '442', '446', '450', '454', '458', '462', '466', '470', '474', '478', '480',
+            '484', '492', '496', '498', '499', '500', '504', '508', '512', '516', '520', '524', '528', '531', '533',
+            '534', '535', '540', '548', '554', '558', '562', '566', '570', '574', '578', '580', '581', '583', '584',
+            '585', '586', '591', '598', '600', '604', '608', '612', '616', '620', '624', '626', '630', '634', '638',
+            '642', '643', '646', '652', '654', '659', '660', '662', '663', '666', '670', '674', '678', '682', '686',
+            '688', '690', '694', '702', '703', '704', '705', '706', '710', '716', '724', '728', '729', '732', '740',
+            '744', '748', '752', '756', '760', '762', '764', '768', '772', '776', '780', '784', '788', '792', '795',
+            '796', '798', '800', '804', '807', '818', '826', '831', '832', '833', '834', '840', '850', '854', '858',
+            '860', '862', '876', '882', '887', '894', '064', '068', '070',
+        ],
+    ];
+}
diff --git a/src/Traits/HasLanguageCodeValues.php b/src/Traits/HasLanguageCodeValues.php
new file mode 100644
index 0000000..909436c
--- /dev/null
+++ b/src/Traits/HasLanguageCodeValues.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Intervention\Validation\Traits;
+
+trait HasLanguageCodeValues
+{
+    /**
+     * @var array<string>
+     */
+    protected static array $languageCodeValues = [
+        'aa', 'ab', 'ae', 'af', 'ak', 'am', 'an', 'ar', 'as', 'av', 'ay', 'az', 'ba', 'be', 'bg', 'bh', 'bi', 'bm',
+        'bn', 'bo', 'br', 'bs', 'ca', 'ce', 'ch', 'co', 'cr', 'cs', 'cu', 'cv', 'cy', 'da', 'de', 'dv', 'dz', 'ee',
+        'el', 'en', 'eo', 'es', 'et', 'eu', 'fa', 'ff', 'fi', 'fj', 'fo', 'fr', 'fy', 'ga', 'gd', 'gl', 'gn', 'gu',
+        'gv', 'ha', 'he', 'hi', 'ho', 'hr', 'ht', 'hu', 'hy', 'hz', 'ia', 'id', 'ie', 'ig', 'ii', 'ik', 'io', 'is',
+        'it', 'iu', 'ja', 'jv', 'ka', 'kg', 'ki', 'kj', 'kk', 'kl', 'km', 'kn', 'ko', 'kr', 'ks', 'ku', 'kv', 'kw',
+        'ky', 'la', 'lb', 'lg', 'li', 'ln', 'lo', 'lt', 'lu', 'lv', 'mg', 'mh', 'mi', 'mk', 'ml', 'mn', 'mr', 'ms',
+        'mt', 'my', 'na', 'nb', 'nd', 'ne', 'ng', 'nl', 'nn', 'no', 'nr', 'nv', 'ny', 'oc', 'oj', 'om', 'or', 'os',
+        'pa', 'pi', 'pl', 'ps', 'pt', 'qu', 'rm', 'rn', 'ro', 'ru', 'rw', 'sa', 'sc', 'sd', 'se', 'sg', 'si', 'sk',
+        'sl', 'sm', 'sn', 'so', 'sq', 'sr', 'ss', 'st', 'su', 'sv', 'sw', 'ta', 'te', 'tg', 'th', 'ti', 'tk', 'tl',
+        'tn', 'to', 'tr', 'ts', 'tt', 'tw', 'ty', 'ug', 'uk', 'ur', 'uz', 've', 'vi', 'vo', 'wa', 'wo', 'xh', 'yi',
+        'yo', 'za', 'zh', 'zu',
+    ];
+}
diff --git a/src/lang/ar/validation.php b/src/lang/ar/validation.php
index 1aee926..d178bf9 100644
--- a/src/lang/ar/validation.php
+++ b/src/lang/ar/validation.php
@@ -37,4 +37,5 @@
     'countrycode' => 'يجب أن يكون :attribute رمز بلد صالحًا.',
     'languagecode' => 'يجب أن يكون :attribute رمز لغة صالحًا.',
     'currencycode' => 'يجب أن يكون :attribute رمز عملة صالحًا.',
+    'languagetag' => 'يجب أن يكون :attribute علامة لغة صالحة.',
 ];
diff --git a/src/lang/bn/validation.php b/src/lang/bn/validation.php
index ed4eceb..be41de9 100644
--- a/src/lang/bn/validation.php
+++ b/src/lang/bn/validation.php
@@ -37,4 +37,5 @@
     'countrycode' => 'এই :attribute টি একটি বৈধ দেশ কোড হতে হবে.',
     'languagecode' => 'এই :attribute টি একটি বৈধ ভাষা কোড হতে হবে.',
     'currencycode' => 'এই :attribute টি একটি বৈধ মুদ্রা কোড হতে হবে.',
+    'languagetag' => 'এই :attribute টি একটি বৈধ ভাষা ট্যাগ হতে হবে.',
 ];
diff --git a/src/lang/de/validation.php b/src/lang/de/validation.php
index b77e631..69b858d 100644
--- a/src/lang/de/validation.php
+++ b/src/lang/de/validation.php
@@ -46,4 +46,5 @@
     'countrycode' => 'Der Wert :attribute muss einen gültigen Ländercode enthalten.',
     'languagecode' => 'Der Wert :attribute muss einen gültigen Sprachcode enthalten.',
     'currencycode' => 'Der Wert :attribute muss einen gültigen Währungscode enthalten.',
+    'languagetag' => 'Der Wert :attribute muss einen gültigen Sprach-Tag enthalten.',
 ];
diff --git a/src/lang/en/validation.php b/src/lang/en/validation.php
index 94fe54c..9a6bea1 100644
--- a/src/lang/en/validation.php
+++ b/src/lang/en/validation.php
@@ -45,4 +45,5 @@
     'countrycode' => 'The :attribute must be a valid country code.',
     'languagecode' => 'The :attribute must be a valid language code.',
     'currencycode' => 'The :attribute must be a valid currency code.',
+    'languagetag' => 'The :attribute must be a valid language tag.',
 ];
diff --git a/src/lang/es/validation.php b/src/lang/es/validation.php
index 09afe14..123faf1 100644
--- a/src/lang/es/validation.php
+++ b/src/lang/es/validation.php
@@ -44,4 +44,5 @@
     'countrycode' => ':attribute debe ser un código de país válido.',
     'languagecode' => ':attribute debe ser un código de idioma válido.',
     'currencycode' => ':attribute debe ser un código de moneda válido.',
+    'languagetag' => ':attribute debe ser una etiqueta de idioma válida.',
 ];
diff --git a/src/lang/fa/validation.php b/src/lang/fa/validation.php
index af13f98..c926a6a 100644
--- a/src/lang/fa/validation.php
+++ b/src/lang/fa/validation.php
@@ -37,4 +37,5 @@
     'countrycode' => 'مقدار :attribute باید یک کد کشور معتبر باشد.',
     'languagecode' => 'مقدار :attribute باید یک کد زبان معتبر باشد.',
     'currencycode' => 'مقدار :attribute باید یک کد واحد پول معتبر باشد.',
+    'languagetag' => 'مقدار :attribute باید یک برچسب زبان معتبر باشد.',
 ];
diff --git a/src/lang/fi/validation.php b/src/lang/fi/validation.php
index 3af9eec..87afaff 100644
--- a/src/lang/fi/validation.php
+++ b/src/lang/fi/validation.php
@@ -43,4 +43,5 @@
     'countrycode' => ':attribute on oltava kelvollinen maakoodi.',
     'languagecode' => ':attribute on oltava kelvollinen kielikoodi.',
     'currencycode' => ':attribute on oltava kelvollinen valuuttakoodi.',
+    'languagetag' => ':attribute on oltava kelvollinen kielitunniste.',
 ];
diff --git a/src/lang/fr/validation.php b/src/lang/fr/validation.php
index 9789f95..d5564ed 100644
--- a/src/lang/fr/validation.php
+++ b/src/lang/fr/validation.php
@@ -52,4 +52,5 @@
     'countrycode' => 'Le champ :attribute doit être un code de pays valide.',
     'languagecode' => 'Le champ :attribute doit être un code de langue valide.',
     'currencycode' => 'Le champ :attribute doit être un code de devise valide.',
+    'languagetag' => 'Le champ :attribute doit être un tag de langue valide.',
 ];
diff --git a/src/lang/id/validation.php b/src/lang/id/validation.php
index 8070731..c1aa270 100644
--- a/src/lang/id/validation.php
+++ b/src/lang/id/validation.php
@@ -38,4 +38,5 @@
     'countrycode' => ':attribute harus berupa kode negara yang valid.',
     'languagecode' => ':attribute harus berupa kode bahasa yang valid.',
     'currencycode' => ':attribute harus berupa kode mata uang yang valid.',
+    'languagetag' => ':attribute harus berupa tag bahasa yang valid.',
 ];
diff --git a/src/lang/nl/validation.php b/src/lang/nl/validation.php
index 4da2e70..f058950 100644
--- a/src/lang/nl/validation.php
+++ b/src/lang/nl/validation.php
@@ -44,4 +44,5 @@
     'countrycode' => ':attribute moet een geldige landcode zijn.',
     'languagecode' => ':attribute moet een geldige taalcode zijn.',
     'currencycode' => ':attribute moet een geldige valutacode zijn.',
+    'languagetag' => ':attribute moet een geldige taaltag zijn.',
 ];
diff --git a/src/lang/uk/validation.php b/src/lang/uk/validation.php
index 957b7be..076c442 100644
--- a/src/lang/uk/validation.php
+++ b/src/lang/uk/validation.php
@@ -44,4 +44,5 @@
     'countrycode' => 'Поле :attribute повинно містити дійсний код країни.',
     'languagecode' => 'Поле :attribute повинно містити дійсний код мови.',
     'currencycode' => 'Поле :attribute повинно містити дійсний код валюти.',
+    'languagetag' => 'Поле :attribute повинно містити дійсний тег мови.',
 ];
diff --git a/tests/Rules/LanguageTagTest.php b/tests/Rules/LanguageTagTest.php
new file mode 100644
index 0000000..7519bcf
--- /dev/null
+++ b/tests/Rules/LanguageTagTest.php
@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Intervention\Validation\Tests\Rules;
+
+use Generator;
+use Intervention\Validation\Rules\LanguageTag;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+final class LanguageTagTest extends TestCase
+{
+    #[DataProvider('dataProvider')]
+    public function testValidation(
+        bool $result,
+        string $value,
+        string $delimiter,
+        bool $allowScript,
+        bool $allowRegion,
+        bool $allowVariants,
+        bool $allowExtensions,
+        bool $allowPrivateUse,
+        bool $strict,
+    ): void {
+        $rule = new LanguageTag(
+            $delimiter,
+            $allowScript,
+            $allowRegion,
+            $allowVariants,
+            $allowExtensions,
+            $allowPrivateUse,
+            $strict,
+        );
+        $this->assertEquals($rule->isValid($value), $result);
+    }
+
+    public static function dataProvider(): Generator
+    {
+        yield [true, 'de', '-', true, true, true, true, true, true];
+        yield [true, 'de-DE', '-', true, true, true, true, true, true];
+        yield [true, 'en-Latn-US', '-', true, true, true, true, true, true];
+        yield [true, 'de-1996', '-', true, true, true, true, true, true];
+        yield [true, 'sl-rozaj', '-', true, true, true, true, true, true];
+        yield [true, 'sl-rozaj-biske', '-', true, true, true, true, true, true];
+        yield [true, 'zh-Hans-CN', '-', true, true, true, true, true, true];
+        yield [true, 'en-US-u-ca-gregory', '-', true, true, true, true, true, true];
+        yield [true, 'fr-CA-x-company', '-', true, true, true, true, true, true];
+
+        yield [true, 'de', '-', false, false, false, false, false, true]; // disallow all
+        yield [false, 'de-', '-', false, false, false, false, false, true]; // disallow all
+        yield [false, 'de-DE', '-', true, false, true, true, true, true]; // disallow region
+        yield [false, 'en-Latn-US', '-', false, true, true, true, true, true]; // disallow script
+        yield [false, 'fr-CA-x-company', '-', true, true, true, true, false, true]; // disallow privateuse
+
+        yield [false, 'de-de', '-', false, true, false, false, false, true]; // lowercase language+region but strict
+        yield [true, 'de-de', '-', false, true, false, false, false, false]; // lowercase language+region not strict
+        yield [true, 'DE-DE', '-', false, true, false, false, false, false]; // uppercase language+region not strict
+
+        yield [false, 'en-latn', '-', true, true, true, true, true, true]; // lowercase script but strict
+        yield [true, 'en-latn', '-', true, true, true, true, true, false]; // lowercase script not strict
+
+        yield [true, 'de_DE', '_', true, true, true, true, true, true]; // different delimiter
+
+        yield [false, 'xxx', '_', true, true, true, true, true, true];
+        yield [false, '___', '', true, true, true, true, true, true];
+        yield [false, 'X-X', '', true, true, true, true, true, true];
+        yield [false, 'x-x', '-', true, true, true, true, true, false];
+    }
+}