diff --git a/.github/workflows/forge-stable.yaml b/.github/workflows/forge-stable.yaml
index e63a78eb4c13e..a50b935fe6f75 100644
--- a/.github/workflows/forge-stable.yaml
+++ b/.github/workflows/forge-stable.yaml
@@ -45,6 +45,7 @@ jobs:
     outputs:
       IMAGE_TAG: ${{ steps.get-docker-image-tag.outputs.IMAGE_TAG }}
       BRANCH: ${{ steps.determine-test-branch.outputs.BRANCH }}
+      BRANCH_HASH: ${{ steps.hash-branch.outputs.BRANCH_HASH }}
     steps:
       - uses: actions/checkout@v3
 
@@ -69,6 +70,20 @@ jobs:
             echo "BRANCH=${{ inputs.GIT_SHA }}" >> $GITHUB_OUTPUT
           fi
 
+      # Use the branch hash instead of the full branch name to stay under kubernetes namespace length limit
+      - name: Hash the branch
+        id: hash-branch
+        run: |
+          # If BRANCH is empty, default to "main"
+          if [ -z "${{ steps.determine-test-branch.outputs.BRANCH }}" ]; then
+            BRANCH="main"
+          else
+            BRANCH="${{ steps.determine-test-branch.outputs.BRANCH }}"
+          fi
+
+          # Hashing the branch name
+          echo "BRANCH_HASH=$(echo -n "$BRANCH" | sha256sum | cut -c1-10)" >> $GITHUB_OUTPUT
+
       - uses: aptos-labs/aptos-core/.github/actions/check-aptos-core@main
         with:
           cancel-workflow: ${{ github.event_name == 'schedule' }} # Cancel the workflow if it is scheduled on a fork
@@ -110,7 +125,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-realistic-env-max-load-long-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-realistic-env-max-load-long-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 7200 # Run for 2 hours
       FORGE_TEST_SUITE: realistic_env_max_load_large
       POST_TO_SLACK: true
@@ -122,7 +137,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-realistic-env-load-sweep-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-realistic-env-load-sweep-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 1500 # Run for 25 minutes (5 tests, each for 300 seconds)
       FORGE_TEST_SUITE: realistic_env_load_sweep
       POST_TO_SLACK: true
@@ -134,7 +149,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-realistic-env-workload-sweep-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-realistic-env-workload-sweep-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 1600 # Run for 26 minutes (4 tests, each for 400 seconds)
       FORGE_TEST_SUITE: realistic_env_workload_sweep
       POST_TO_SLACK: true
@@ -146,7 +161,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-realistic-env-graceful-overload-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-realistic-env-graceful-overload-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 1200 # Run for 20 minutes
       FORGE_TEST_SUITE: realistic_env_graceful_overload
       POST_TO_SLACK: true
@@ -158,7 +173,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-realistic-network-tuned-for-throughput-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-realistic-network-tuned-for-throughput-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 900 # Run for 15 minutes
       FORGE_TEST_SUITE: realistic_network_tuned_for_throughput
       FORGE_ENABLE_PERFORMANCE: true
@@ -173,7 +188,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-consensus-stress-test-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-consensus-stress-test-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 2400 # Run for 40 minutes
       FORGE_TEST_SUITE: consensus_stress_test
       POST_TO_SLACK: true
@@ -185,7 +200,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-workload-mix-test-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-workload-mix-test-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 900 # Run for 15 minutes
       FORGE_TEST_SUITE: workload_mix
       POST_TO_SLACK: true
@@ -197,7 +212,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-continuous-e2e-single-vfn-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-continuous-e2e-single-vfn-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 480 # Run for 8 minutes
       FORGE_TEST_SUITE: single_vfn_perf
       POST_TO_SLACK: true
@@ -209,7 +224,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-haproxy-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-haproxy-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 600 # Run for 10 minutes
       FORGE_ENABLE_HAPROXY: true
       FORGE_TEST_SUITE: realistic_env_max_load
@@ -222,7 +237,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-fullnode-reboot-stress-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-fullnode-reboot-stress-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 1800 # Run for 30 minutes
       FORGE_TEST_SUITE: fullnode_reboot_stress_test
       POST_TO_SLACK: true
@@ -235,7 +250,7 @@ jobs:
     uses: aptos-labs/aptos-core/.github/workflows/workflow-run-forge.yaml@main
     secrets: inherit
     with:
-      FORGE_NAMESPACE: forge-compat-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-compat-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 300 # Run for 5 minutes
       # This will upgrade from testnet branch to the latest main
       FORGE_TEST_SUITE: compat
@@ -252,7 +267,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-changing-working-quorum-test-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-changing-working-quorum-test-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 1200 # Run for 20 minutes
       FORGE_TEST_SUITE: changing_working_quorum_test
       POST_TO_SLACK: true
@@ -265,7 +280,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-changing-working-quorum-test-high-load-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-changing-working-quorum-test-high-load-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 900 # Run for 15 minutes
       FORGE_TEST_SUITE: changing_working_quorum_test_high_load
       POST_TO_SLACK: true
@@ -279,7 +294,7 @@ jobs:
     secrets: inherit
     with:
       IMAGE_TAG: ${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
-      FORGE_NAMESPACE: forge-pfn-const-tps-with-realistic-env-${{ needs.determine-test-metadata.outputs.IMAGE_TAG }}
+      FORGE_NAMESPACE: forge-pfn-const-tps-with-realistic-env-${{ needs.determine-test-metadata.outputs.BRANCH_HASH }}
       FORGE_RUNNER_DURATION_SECS: 900 # Run for 15 minutes
       FORGE_TEST_SUITE: pfn_const_tps_with_realistic_env
       POST_TO_SLACK: true
diff --git a/testsuite/forge.py b/testsuite/forge.py
index 67850bed4069d..ad50d0d5c5680 100644
--- a/testsuite/forge.py
+++ b/testsuite/forge.py
@@ -1249,6 +1249,11 @@ async def run_multiple(
             )
 
 
+def seeded_random_choice(namespace: str, cluster_names: Sequence[str]) -> str:
+    random.seed(namespace)
+    return random.choice(cluster_names)
+
+
 @main.command()
 # output files
 @envoption("FORGE_OUTPUT")
@@ -1366,6 +1371,7 @@ def test(
         forge_namespace = f"forge-{processes.user()}-{time.epoch()}"
 
     assert forge_namespace is not None, "Forge namespace is required"
+    assert len(forge_namespace) <= 63, "Forge namespace must be 63 characters or less"
 
     forge_namespace = sanitize_forge_resource_name(forge_namespace)
 
@@ -1418,7 +1424,7 @@ def test(
     # Perform cluster selection
     if not forge_cluster_name or balance_clusters:
         cluster_names = config.get("enabled_clusters")
-        forge_cluster_name = random.choice(cluster_names)
+        forge_cluster_name = seeded_random_choice(forge_namespace, cluster_names)
 
     assert forge_cluster_name, "Forge cluster name is required"