diff --git a/tests/functional/test_config_settings.py b/tests/functional/test_config_settings.py
index 4e0b12ca185..9f8f8d4bde7 100644
--- a/tests/functional/test_config_settings.py
+++ b/tests/functional/test_config_settings.py
@@ -179,6 +179,7 @@ def test_backend_sees_config_via_constraint(script: PipTestEnvironment) -> None:
             assert json.loads(output) == {"FOO": "Hello"}
 
 
+@pytest.mark.network
 def test_backend_sees_config_via_sdist(script: PipTestEnvironment) -> None:
     name, version, project_dir = make_project(script.scratch_path)
     dists_dir = script.scratch_path / "dists"
diff --git a/tests/functional/test_install.py b/tests/functional/test_install.py
index 1dc46cf8621..e97f2fae8cb 100644
--- a/tests/functional/test_install.py
+++ b/tests/functional/test_install.py
@@ -1917,6 +1917,7 @@ def test_double_install(script: PipTestEnvironment) -> None:
     assert msg not in result.stderr
 
 
+@pytest.mark.network
 def test_double_install_fail(
     script: PipTestEnvironment, resolver_variant: ResolverVariant
 ) -> None:
@@ -2676,6 +2677,7 @@ def test_install_pip_prints_req_chain_pypi(script: PipTestEnvironment) -> None:
     )
 
 
+@pytest.mark.network
 @pytest.mark.parametrize("common_prefix", ["", "linktest-1.0/"])
 def test_install_sdist_links(script: PipTestEnvironment, common_prefix: str) -> None:
     """
diff --git a/tests/functional/test_install_config.py b/tests/functional/test_install_config.py
index b8fa56bffc9..7ca9eb2469e 100644
--- a/tests/functional/test_install_config.py
+++ b/tests/functional/test_install_config.py
@@ -417,6 +417,7 @@ def flags(
     return flags
 
 
+@pytest.mark.network
 def test_prompt_for_keyring_if_needed(
     data: TestData,
     cert_factory: CertFactory,
diff --git a/tests/functional/test_lock.py b/tests/functional/test_lock.py
index b99850526e1..709ce54cff7 100644
--- a/tests/functional/test_lock.py
+++ b/tests/functional/test_lock.py
@@ -181,6 +181,7 @@ def test_lock_local_editable_with_dep(
     ]
 
 
+@pytest.mark.network
 def test_lock_vcs(script: PipTestEnvironment, shared_data: TestData) -> None:
     result = script.pip(
         "lock",
@@ -205,6 +206,7 @@ def test_lock_vcs(script: PipTestEnvironment, shared_data: TestData) -> None:
     ]
 
 
+@pytest.mark.network
 def test_lock_archive(script: PipTestEnvironment, shared_data: TestData) -> None:
     result = script.pip(
         "lock",