diff --git a/tests/test_tutorial/test_additional_responses/test_tutorial002.py b/tests/test_tutorial/test_additional_responses/test_tutorial002.py
index 586779e44f..f1b53a96ce 100644
--- a/tests/test_tutorial/test_additional_responses/test_tutorial002.py
+++ b/tests/test_tutorial/test_additional_responses/test_tutorial002.py
@@ -6,7 +6,7 @@ import pytest
 from fastapi.testclient import TestClient
 from inline_snapshot import snapshot
 
-from tests.utils import needs_py310
+from tests.utils import needs_py310, workdir_lock
 
 
 @pytest.fixture(
@@ -29,6 +29,7 @@ def test_path_operation(client: TestClient):
     assert response.json() == {"id": "foo", "value": "there goes my hero"}
 
 
+@workdir_lock
 def test_path_operation_img(client: TestClient):
     shutil.copy("./docs/en/docs/img/favicon.png", "./image.png")
     response = client.get("/items/foo?img=1")
diff --git a/tests/test_tutorial/test_additional_responses/test_tutorial004.py b/tests/test_tutorial/test_additional_responses/test_tutorial004.py
index fe56fbb8b5..c6d517f205 100644
--- a/tests/test_tutorial/test_additional_responses/test_tutorial004.py
+++ b/tests/test_tutorial/test_additional_responses/test_tutorial004.py
@@ -6,7 +6,7 @@ import pytest
 from fastapi.testclient import TestClient
 from inline_snapshot import snapshot
 
-from tests.utils import needs_py310
+from tests.utils import needs_py310, workdir_lock
 
 
 @pytest.fixture(
@@ -29,6 +29,7 @@ def test_path_operation(client: TestClient):
     assert response.json() == {"id": "foo", "value": "there goes my hero"}
 
 
+@workdir_lock
 def test_path_operation_img(client: TestClient):
     shutil.copy("./docs/en/docs/img/favicon.png", "./image.png")
     response = client.get("/items/foo?img=1")
diff --git a/tests/test_tutorial/test_background_tasks/test_tutorial001.py b/tests/test_tutorial/test_background_tasks/test_tutorial001.py
index 100583f77a..1fc919c399 100644
--- a/tests/test_tutorial/test_background_tasks/test_tutorial001.py
+++ b/tests/test_tutorial/test_background_tasks/test_tutorial001.py
@@ -4,10 +4,12 @@ from pathlib import Path
 from fastapi.testclient import TestClient
 
 from docs_src.background_tasks.tutorial001_py310 import app
+from tests.utils import workdir_lock
 
 client = TestClient(app)
 
 
+@workdir_lock
 def test():
     log = Path("log.txt")
     if log.is_file():
diff --git a/tests/test_tutorial/test_background_tasks/test_tutorial002.py b/tests/test_tutorial/test_background_tasks/test_tutorial002.py
index f29402c833..31b58cde1f 100644
--- a/tests/test_tutorial/test_background_tasks/test_tutorial002.py
+++ b/tests/test_tutorial/test_background_tasks/test_tutorial002.py
@@ -5,7 +5,7 @@ from pathlib import Path
 import pytest
 from fastapi.testclient import TestClient
 
-from ...utils import needs_py310
+from tests.utils import needs_py310, workdir_lock
 
 
 @pytest.fixture(
@@ -22,6 +22,7 @@ def get_client(request: pytest.FixtureRequest):
     return client
 
 
+@workdir_lock
 def test(client: TestClient):
     log = Path("log.txt")
     if log.is_file():
diff --git a/tests/test_tutorial/test_custom_docs_ui/test_tutorial001.py b/tests/test_tutorial/test_custom_docs_ui/test_tutorial001.py
index f7eb7fd97d..ae25497f32 100644
--- a/tests/test_tutorial/test_custom_docs_ui/test_tutorial001.py
+++ b/tests/test_tutorial/test_custom_docs_ui/test_tutorial001.py
@@ -4,6 +4,8 @@ from pathlib import Path
 import pytest
 from fastapi.testclient import TestClient
 
+from tests.utils import workdir_lock
+
 
 @pytest.fixture(scope="module")
 def client():
@@ -17,6 +19,7 @@ def client():
     static_dir.rmdir()
 
 
+@workdir_lock
 def test_swagger_ui_html(client: TestClient):
     response = client.get("/docs")
     assert response.status_code == 200, response.text
@@ -24,18 +27,21 @@ def test_swagger_ui_html(client: TestClient):
     assert "https://unpkg.com/swagger-ui-dist@5/swagger-ui.css" in response.text
 
 
+@workdir_lock
 def test_swagger_ui_oauth2_redirect_html(client: TestClient):
     response = client.get("/docs/oauth2-redirect")
     assert response.status_code == 200, response.text
     assert "window.opener.swaggerUIRedirectOauth2" in response.text
 
 
+@workdir_lock
 def test_redoc_html(client: TestClient):
     response = client.get("/redoc")
     assert response.status_code == 200, response.text
     assert "https://unpkg.com/redoc@2/bundles/redoc.standalone.js" in response.text
 
 
+@workdir_lock
 def test_api(client: TestClient):
     response = client.get("/users/john")
     assert response.status_code == 200, response.text
diff --git a/tests/test_tutorial/test_custom_docs_ui/test_tutorial002.py b/tests/test_tutorial/test_custom_docs_ui/test_tutorial002.py
index 28945d8387..ac67170d74 100644
--- a/tests/test_tutorial/test_custom_docs_ui/test_tutorial002.py
+++ b/tests/test_tutorial/test_custom_docs_ui/test_tutorial002.py
@@ -4,6 +4,8 @@ from pathlib import Path
 import pytest
 from fastapi.testclient import TestClient
 
+from tests.utils import workdir_lock
+
 
 @pytest.fixture(scope="module")
 def client():
@@ -17,6 +19,7 @@ def client():
     static_dir.rmdir()
 
 
+@workdir_lock
 def test_swagger_ui_html(client: TestClient):
     response = client.get("/docs")
     assert response.status_code == 200, response.text
@@ -24,18 +27,21 @@ def test_swagger_ui_html(client: TestClient):
     assert "/static/swagger-ui.css" in response.text
 
 
+@workdir_lock
 def test_swagger_ui_oauth2_redirect_html(client: TestClient):
     response = client.get("/docs/oauth2-redirect")
     assert response.status_code == 200, response.text
     assert "window.opener.swaggerUIRedirectOauth2" in response.text
 
 
+@workdir_lock
 def test_redoc_html(client: TestClient):
     response = client.get("/redoc")
     assert response.status_code == 200, response.text
     assert "/static/redoc.standalone.js" in response.text
 
 
+@workdir_lock
 def test_api(client: TestClient):
     response = client.get("/users/john")
     assert response.status_code == 200, response.text
diff --git a/tests/test_tutorial/test_events/test_tutorial002.py b/tests/test_tutorial/test_events/test_tutorial002.py
index 47af7a9527..262d936f98 100644
--- a/tests/test_tutorial/test_events/test_tutorial002.py
+++ b/tests/test_tutorial/test_events/test_tutorial002.py
@@ -3,6 +3,8 @@ from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from inline_snapshot import snapshot
 
+from tests.utils import workdir_lock
+
 
 @pytest.fixture(name="app", scope="module")
 def get_app():
@@ -11,6 +13,7 @@ def get_app():
     yield app
 
 
+@workdir_lock
 def test_events(app: FastAPI):
     with TestClient(app) as client:
         response = client.get("/items/")
@@ -20,6 +23,7 @@ def test_events(app: FastAPI):
         assert "Application shutdown" in log.read()
 
 
+@workdir_lock
 def test_openapi_schema(app: FastAPI):
     with TestClient(app) as client:
         response = client.get("/openapi.json")
diff --git a/tests/test_tutorial/test_static_files/test_tutorial001.py b/tests/test_tutorial/test_static_files/test_tutorial001.py
index 1d57310f30..d2b120fbb9 100644
--- a/tests/test_tutorial/test_static_files/test_tutorial001.py
+++ b/tests/test_tutorial/test_static_files/test_tutorial001.py
@@ -5,6 +5,8 @@ import pytest
 from fastapi.testclient import TestClient
 from inline_snapshot import snapshot
 
+from tests.utils import workdir_lock
+
 
 @pytest.fixture(scope="module")
 def client():
@@ -20,17 +22,20 @@ def client():
     static_dir.rmdir()
 
 
+@workdir_lock
 def test_static_files(client: TestClient):
     response = client.get("/static/sample.txt")
     assert response.status_code == 200, response.text
     assert response.text == "This is a sample static file."
 
 
+@workdir_lock
 def test_static_files_not_found(client: TestClient):
     response = client.get("/static/non_existent_file.txt")
     assert response.status_code == 404, response.text
 
 
+@workdir_lock
 def test_openapi_schema(client: TestClient):
     response = client.get("/openapi.json")
     assert response.status_code == 200, response.text
diff --git a/tests/test_tutorial/test_templates/test_tutorial001.py b/tests/test_tutorial/test_templates/test_tutorial001.py
index 04bc3fce86..f0377e963c 100644
--- a/tests/test_tutorial/test_templates/test_tutorial001.py
+++ b/tests/test_tutorial/test_templates/test_tutorial001.py
@@ -3,7 +3,10 @@ import shutil
 
 from fastapi.testclient import TestClient
 
+from tests.utils import workdir_lock
 
+
+@workdir_lock
 def test_main():
     if os.path.isdir("./static"):  # pragma: nocover
         shutil.rmtree("./static")
diff --git a/tests/utils.py b/tests/utils.py
index 09c4e13b00..fff7348b9c 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -9,6 +9,8 @@ needs_py314 = pytest.mark.skipif(
     sys.version_info < (3, 14), reason="requires python3.14+"
 )
 
+workdir_lock = pytest.mark.xdist_group("workdir_lock")
+
 
 def skip_module_if_py_gte_314():
     """Skip entire module on Python 3.14+ at import time."""