diff --git a/eng/common/actions/login-to-github/action.yml b/eng/common/actions/login-to-github/action.yml
new file mode 100644
index 0000000000..679be38280
--- /dev/null
+++ b/eng/common/actions/login-to-github/action.yml
@@ -0,0 +1,102 @@
+# Login to GitHub - Composite Action
+#
+# Mints a GitHub App installation access token using Azure Key Vault signing.
+# This action wraps eng/common/scripts/login-to-github.ps1 for use in GitHub
+# Actions workflows. The same script is used by Azure DevOps pipelines via
+# eng/common/pipelines/templates/steps/login-to-github.yml.
+#
+# IMPORTANT: This action requires Azure CLI to be pre-authenticated.
+# You must call azure/login BEFORE this action in your workflow.
+# This is because composite actions cannot call azure/login internally.
+#
+# Usage (single owner):
+#   jobs:
+#     my-job:
+#       # An environment is required for OIDC (federated credential) login.
+#       # Work with EngSys to configure the environment with the federated
+#       # credential for the AzureSDKEngKeyVault Secrets service connection.
+#       environment: AzureSDKEngKeyVault
+#       permissions:
+#         id-token: write  # Required for azure/login OIDC
+#       steps:
+#         # Step 1: Authenticate to Azure (required before this action)
+#         - uses: azure/login@v2
+#           with:
+#             client-id: 5786d1fb-187e-4ca9-9a81-ab89ea278986
+#             tenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47
+#             subscription-id: a18897a6-7e44-457d-9260-f2854c0aca42
+#
+#         # Step 2: Mint GitHub App token
+#         - uses: ./eng/common/actions/login-to-github
+#           with:
+#             token-owners: Azure
+#
+#         # Step 3: Use the token (available as env var in all subsequent steps)
+#         - run: gh pr list --repo Azure/azure-sdk-tools
+#           env:
+#             GH_TOKEN: ${{ env.GH_TOKEN }}
+#
+# Usage (multiple owners):
+#         - uses: ./eng/common/actions/login-to-github
+#           with:
+#             token-owners: Azure,azure-sdk,MicrosoftDocs
+#
+#         - run: gh pr list --repo Azure/azure-sdk-tools
+#           env:
+#             GH_TOKEN: ${{ env.GH_TOKEN_Azure }}
+#
+# Tokens are exported to GITHUB_ENV so all subsequent steps can reference
+# them as ${{ env.GH_TOKEN }} (single owner) or ${{ env.GH_TOKEN_<Owner> }}
+# (multiple owners). This matches the Azure DevOps behavior where tokens
+# are set as pipeline variables.
+
+name: 'Login to GitHub'
+description: 'Mint a GitHub App installation token via Azure Key Vault signing'
+
+inputs:
+  token-owners:
+    description: >
+      Comma-separated list of GitHub organizations or users for which to
+      obtain installation tokens (e.g. "Azure" or "Azure,azure-sdk").
+    required: false
+    default: 'Azure'
+  variable-name-prefix:
+    description: >
+      Prefix for the exported variable name. With a single owner the
+      variable is named exactly this (default GH_TOKEN). With multiple
+      owners each variable is named <prefix>_<owner>.
+    required: false
+    default: 'GH_TOKEN'
+  key-vault-name:
+    description: 'Azure Key Vault name containing the signing key'
+    required: false
+    default: 'azuresdkengkeyvault'
+  key-name:
+    description: 'Name of the RSA key in Key Vault'
+    required: false
+    default: 'azure-sdk-automation'
+  app-id:
+    description: 'GitHub App numeric ID'
+    required: false
+    default: '1086291'
+
+runs:
+  using: 'composite'
+  steps:
+    - shell: pwsh
+      env:
+        INPUT_TOKEN_OWNERS: ${{ inputs.token-owners }}
+        INPUT_VARIABLE_NAME_PREFIX: ${{ inputs.variable-name-prefix }}
+        INPUT_KEY_VAULT_NAME: ${{ inputs.key-vault-name }}
+        INPUT_KEY_NAME: ${{ inputs.key-name }}
+        INPUT_APP_ID: ${{ inputs.app-id }}
+        ACTION_PATH: ${{ github.action_path }}
+      run: |
+        $scriptPath = Join-Path $env:ACTION_PATH ".." ".." "scripts" "login-to-github.ps1"
+        $owners = $env:INPUT_TOKEN_OWNERS -split ',' | ForEach-Object { $_.Trim() }
+        & $scriptPath `
+          -KeyVaultName $env:INPUT_KEY_VAULT_NAME `
+          -KeyName $env:INPUT_KEY_NAME `
+          -GitHubAppId $env:INPUT_APP_ID `
+          -InstallationTokenOwners $owners `
+          -VariableNamePrefix $env:INPUT_VARIABLE_NAME_PREFIX
diff --git a/eng/common/scripts/login-to-github.ps1 b/eng/common/scripts/login-to-github.ps1
index e911f31eb1..129946a409 100644
--- a/eng/common/scripts/login-to-github.ps1
+++ b/eng/common/scripts/login-to-github.ps1
@@ -3,6 +3,9 @@
   Mints a GitHub App installation access token using Azure Key Vault 'sign' (non-exportable key),
   and logs in the GitHub CLI by setting GH_TOKEN.
 
+  Works in both Azure DevOps pipelines and GitHub Actions workflows.
+  Requires Azure CLI to be pre-authenticated (via AzureCLI@2 in ADO, or azure/login in GH Actions).
+
 .PARAMETER KeyVaultName
   Name of the Azure Key Vault containing the non-exportable RSA key.
 
@@ -16,10 +19,13 @@
   List of GitHub organizations or users for which to obtain installation tokens.
 
 .PARAMETER VariableNamePrefix
-  Name of the ADO variable to set when -SetPipelineVariable is used (default: GH_TOKEN).
+  Prefix for the exported variable name (default: GH_TOKEN).
+  With a single owner, exports as GH_TOKEN. With multiple owners, exports as GH_TOKEN_<Owner>.
 
 .OUTPUTS
-  Writes minimal info to stdout. Token is placed in $env:GH_TOKEN if there is only one owner otherwise $env:GH_TOKEN_<Owner> for each owner.
+  Sets environment variables in the current process and exports them to the CI system:
+  - Azure DevOps: sets secret pipeline variables via ##vso logging commands
+  - GitHub Actions: writes to GITHUB_ENV and masks the token
 #>
 
 [CmdletBinding()]
@@ -98,7 +104,7 @@ function New-GitHubAppJwt {
       --digest $Base64Value | ConvertFrom-Json
 
   if ($LASTEXITCODE -ne 0) {
-    throw "Failed to sign JWT with Azure Key Vault. Error: $SignResult"
+    throw "Failed to sign JWT with Azure Key Vault. Error: $($SignResultJson | ConvertTo-Json -Compress)"
   }
 
   if (!$SignResultJson.signature) {
@@ -167,12 +173,19 @@ foreach ($InstallationTokenOwner in $InstallationTokenOwners)
   # Export for gh CLI & git
   Write-Host "$variableName has been set in the current process."
 
-  # Optionally set an Azure DevOps secret variable (so later tasks can reuse it)
+  # Azure DevOps: set secret pipeline variable (so later tasks can reuse it)
   if ($null -ne $env:SYSTEM_TEAMPROJECTID) {
     Write-Host "##vso[task.setvariable variable=$variableName;issecret=true]$installationToken"
     Write-Host "Azure DevOps variable '$variableName' has been set (secret)."
   }
 
+  # GitHub Actions: mask the token and export to GITHUB_ENV
+  if ($env:GITHUB_ACTIONS -eq 'true') {
+    Write-Host "::add-mask::$installationToken"
+    Add-Content -Path $env:GITHUB_ENV -Value "$variableName=$installationToken"
+    Write-Host "GitHub Actions env variable '$variableName' has been exported."
+  }
+
   try {
     Write-Host "`n--- gh auth status ---"
     $gh_token_value_before = $env:GH_TOKEN