diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 710f0293..687f536c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -92,6 +92,7 @@ jobs:
 
   docker-lint:
     name: Dockerfile lint checks
+    if: github.repository_owner == 'quantumlib'
     # ubuntu-slim runners don't have docker installed.
     runs-on: ubuntu-24.04
     timeout-minutes: 15
@@ -114,6 +115,7 @@ jobs:
 
   shell-lint:
     name: Shell script lint checks
+    if: github.repository_owner == 'quantumlib'
     runs-on: ubuntu-slim
     timeout-minutes: 15
     steps:
@@ -136,6 +138,7 @@ jobs:
 
   yaml-lint:
     name: YAML lint checks
+    if: github.repository_owner == 'quantumlib'
     runs-on: ubuntu-slim
     timeout-minutes: 15
     steps:
@@ -160,6 +163,7 @@ jobs:
 
   bazel-lint:
     name: Bazel build lint checks
+    if: github.repository_owner == 'quantumlib'
     runs-on: ubuntu-slim
     timeout-minutes: 15
     steps:
@@ -183,6 +187,7 @@ jobs:
 
   action-lint:
     name: GitHub Actions lint checks
+    if: github.repository_owner == 'quantumlib'
     runs-on: ubuntu-slim
     timeout-minutes: 15
     steps:
@@ -201,6 +206,7 @@ jobs:
 
   library-tests:
     name: Library tests
+    if: github.repository_owner == 'quantumlib'
     needs:
       - action-lint
       - bazel-lint
@@ -297,6 +303,7 @@ jobs:
 
   options-tests:
     name: Options tests
+    if: github.repository_owner == 'quantumlib'
     needs:
       - action-lint
       - bazel-lint
@@ -352,6 +359,7 @@ jobs:
 
   memory-tests:
     name: Malloc/asan/msan tests
+    if: github.repository_owner == 'quantumlib'
     needs:
       - action-lint
       - bazel-lint
@@ -407,6 +415,7 @@ jobs:
 
   docker-tests:
     name: Docker build tests
+    if: github.repository_owner == 'quantumlib'
     needs:
       - action-lint
       - docker-lint
@@ -448,7 +457,7 @@ jobs:
 
   report-results:
     name: CI
-    if: always()
+    if: always() && github.repository_owner == 'quantumlib'
     needs:
       - action-lint
       - bazel-lint
diff --git a/.github/workflows/cirq_compatibility.yml b/.github/workflows/cirq_compatibility.yml
index 5fc76ff0..9921d46f 100644
--- a/.github/workflows/cirq_compatibility.yml
+++ b/.github/workflows/cirq_compatibility.yml
@@ -35,6 +35,7 @@ concurrency:
 
 jobs:
   test-compatibility:
+    if: github.repository_owner == 'quantumlib'
     name: Test Cirq compatibility
     runs-on: ubuntu-24.04
     timeout-minutes: 30