diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 8cb8045ef42..e9bc38cbcae 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -11,6 +11,7 @@ jobs:
 
     # CodeQL runs on ubuntu-latest and windows-latest
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
 
     steps:
     - name: Checkout repository
diff --git a/.github/workflows/ensure-related-repos-run-crons.yml b/.github/workflows/ensure-related-repos-run-crons.yml
index f6faff6b67f..a26fb5b7992 100644
--- a/.github/workflows/ensure-related-repos-run-crons.yml
+++ b/.github/workflows/ensure-related-repos-run-crons.yml
@@ -14,6 +14,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
 
     steps:
     - name: Configure git
diff --git a/.github/workflows/nightly.yaml b/.github/workflows/nightly.yaml
index c207c19ace2..d425bea605f 100644
--- a/.github/workflows/nightly.yaml
+++ b/.github/workflows/nightly.yaml
@@ -11,6 +11,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
 
     steps:
     - uses: actions/checkout@v2
diff --git a/.github/workflows/twoslash-repros.yaml b/.github/workflows/twoslash-repros.yaml
index 0a8ba026ac4..1e782f8cf98 100644
--- a/.github/workflows/twoslash-repros.yaml
+++ b/.github/workflows/twoslash-repros.yaml
@@ -22,6 +22,7 @@ jobs:
   run:
     if: ${{ !github.event.label && !github.event.inputs.bisect_issue }}
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
     steps:
     - name: Use node
       uses: actions/setup-node@v1
diff --git a/.github/workflows/update-package-lock.yaml b/.github/workflows/update-package-lock.yaml
index 3880b5cae83..5c66d1078eb 100644
--- a/.github/workflows/update-package-lock.yaml
+++ b/.github/workflows/update-package-lock.yaml
@@ -10,6 +10,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: github.repository == 'microsoft/TypeScript'
 
     steps:
     - uses: actions/checkout@v2