diff --git a/.github/workflows/tsan.yml b/.github/workflows/tsan.yml
new file mode 100644
index 00000000..f6957d2b
--- /dev/null
+++ b/.github/workflows/tsan.yml
@@ -0,0 +1,31 @@
+name: tsan
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '**'
+      - '!.gitignore'
+      - '!LICENSE'
+      - '!README.md'
+      - '!docs/**'
+      - '!examples/**'
+      - '.github/workflows/tsan.yml'
+      - '.github/workflows/valgrind.yml'
+  workflow_dispatch:
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: build
+        run: |
+          cmake -B build -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCONFIG_TSAN=ON
+          cmake --build build -j`nproc`
+      - name: test
+        run: |
+          ./build/run-test262 -m -c test262.conf -c test262-fast.conf -a
diff --git a/.github/workflows/valgrind.yml b/.github/workflows/valgrind.yml
index 8f26d6aa..5ea446f9 100644
--- a/.github/workflows/valgrind.yml
+++ b/.github/workflows/valgrind.yml
@@ -11,6 +11,7 @@ on:
       - '!README.md'
       - '!docs/**'
       - '!examples/**'
+      - '.github/workflows/tsan.yml'
       - '.github/workflows/valgrind.yml'
   workflow_dispatch:
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8bd0c3ae..aabaf5a6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -115,6 +115,7 @@ xoption(BUILD_CLI_WITH_MIMALLOC "Build the qjs executable with mimalloc" OFF)
 xoption(BUILD_CLI_WITH_STATIC_MIMALLOC "Build the qjs executable with mimalloc (statically linked)" OFF)
 xoption(CONFIG_ASAN "Enable AddressSanitizer (ASan)" OFF)
 xoption(CONFIG_MSAN "Enable MemorySanitizer (MSan)" OFF)
+xoption(CONFIG_TSAN "Enable ThreadSanitizer (TSan)" OFF)
 xoption(CONFIG_UBSAN "Enable UndefinedBehaviorSanitizer (UBSan)" OFF)
 
 if(CONFIG_ASAN)
@@ -144,6 +145,18 @@ add_link_options(
     -fno-sanitize-recover=all
     -fno-omit-frame-pointer
 )
+elseif(CONFIG_TSAN)
+message(STATUS "Building with TSan")
+add_compile_options(
+    -fsanitize=thread
+    -fno-sanitize-recover=all
+    -fno-omit-frame-pointer
+)
+add_link_options(
+    -fsanitize=thread
+    -fno-sanitize-recover=all
+    -fno-omit-frame-pointer
+)
 elseif(CONFIG_UBSAN)
 message(STATUS "Building with UBSan")
 add_compile_definitions(