diff --git a/.github/workflows/prepare_release.yml b/.github/workflows/prepare_release.yml
new file mode 100644
index 0000000000..b5754a7aa4
--- /dev/null
+++ b/.github/workflows/prepare_release.yml
@@ -0,0 +1,106 @@
+name: Prepare Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      release_type:
+        description: 'Release Type'
+        required: true
+        type: choice
+        options:
+          - major
+          - minor
+      version:
+        description: 'Base Version (e.g., 1.84 or 2.0)'
+        required: true
+        type: string
+      sync_tag:
+        description: 'Sync Tag (e.g., v1.84.0-pre1)'
+        required: true
+        type: string
+permissions:
+  contents: write
+jobs:
+  prepare-release:
+    runs-on: macos-14
+    
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Required to fetch all history for the merge check
+
+      - name: Set up Git configuration
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git fetch --all
+
+      - name: Verify Previous Release is Merged (Major Only)
+        if: ${{ github.event.inputs.release_type == 'major' }}
+        run: |
+          echo "Finding the latest release branch on remote..."
+          
+          # List all remote release branches, sort them by version, and grab the highest one
+          LATEST_BRANCH=$(git branch -r --list "origin/grpc_release_*.x" | sort -V | tail -n 1 | sed 's/origin\///' | tr -d '[:space:]')
+          
+          if [ -z "$LATEST_BRANCH" ]; then
+            echo "⚠️ No previous release branches found on remote. Skipping merge check."
+            exit 0
+          fi
+          
+          echo "Latest release branch found: $LATEST_BRANCH"
+          echo "Checking if $LATEST_BRANCH is merged into main..."
+          
+          # Check if the latest release branch is an ancestor of main
+          if ! git merge-base --is-ancestor origin/$LATEST_BRANCH origin/main; then
+            echo "❌ ERROR: $LATEST_BRANCH has NOT been merged into main!"
+            echo "Please merge the previous release branch into main before cutting a new major release."
+            exit 1
+          else
+            echo "✅ $LATEST_BRANCH is successfully merged into main."
+          fi
+
+      - name: Prepare Branch
+        id: branch_prep
+        run: |
+          VERSION="${{ github.event.inputs.version }}"
+          BRANCH_NAME="grpc_release_${VERSION}.x"
+          
+          if [ "${{ github.event.inputs.release_type }}" == "major" ]; then
+            echo "Preparing Major Release for $BRANCH_NAME..."
+            git checkout main
+            git checkout -b $BRANCH_NAME
+          else
+            echo "Preparing Minor Release for $BRANCH_NAME..."
+            # For minor releases, checkout the existing branch from remote
+            git checkout -b $BRANCH_NAME origin/$BRANCH_NAME
+          fi
+          
+          # Save branch name to environment for later steps
+          echo "branch_name=$BRANCH_NAME" >> $GITHUB_ENV
+
+      - name: Prepare Environment
+        run: |
+          chmod +x ./scripts/prepare_env.sh
+          ./scripts/prepare_env.sh
+
+      - name: Sync gRPC Code
+        run: |
+          source .venv/bin/activate
+          chmod +x ./scripts/sync_grpc_src_shallow.sh
+          ./scripts/sync_grpc_src_shallow.sh ${{ github.event.inputs.sync_tag }}
+
+      - name: Commit Changes
+        run: |
+          git add .
+          git commit -m "Sync c-core ${{ github.event.inputs.sync_tag }}"
+
+      - name: Push Branch and Tag
+        run: |
+          # 1. Push ONLY the new branch (main remains untouched)
+          git push origin ${{ env.branch_name }}
+          
+          # 2. Add the tag and push it
+          git tag ${{ github.event.inputs.sync_tag }}
+          git push origin ${{ github.event.inputs.sync_tag }}
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