diff --git a/README.md b/README.md
index 9635e65..d2370c3 100644
--- a/README.md
+++ b/README.md
@@ -1120,6 +1120,7 @@ client = PlaneClient(
 | `access_token` | `str`                          | Optional | Access token for authentication |
 | `timeout`      | `float \| tuple[float, float]` | `30.0`   | Request timeout in seconds      |
 | `retry`        | `RetryConfig`                  | None     | Retry configuration             |
+| `verify`       | `bool \| str`                  | `True`   | TLS verification: `True` to verify against the system CA store, `False` to disable verification entirely, or a path to a CA bundle file to verify against a custom CA. Passed straight through to `requests.Session.verify` — see [requests: SSL Cert Verification](https://requests.readthedocs.io/en/latest/user/advanced/#ssl-cert-verification). |
 
 **Note**: Provide exactly one of `api_key` or `access_token`.
 
diff --git a/plane/api/base_resource.py b/plane/api/base_resource.py
index 2f89e1e..6958c00 100644
--- a/plane/api/base_resource.py
+++ b/plane/api/base_resource.py
@@ -14,6 +14,7 @@ def __init__(self, config: Configuration, base_path: str) -> None:
         self.config = config
         self.base_path = base_path.rstrip("/")
         self.session = requests.Session()
+        self.session.verify = config.verify
 
         if self.config.retry:
             retry = Retry(
diff --git a/plane/client/oauth_client.py b/plane/client/oauth_client.py
index 9d264de..f15f2be 100644
--- a/plane/client/oauth_client.py
+++ b/plane/client/oauth_client.py
@@ -131,6 +131,7 @@ def __init__(
         client_id: str,
         client_secret: str,
         timeout: float | tuple[float, float] | None = 30.0,
+        verify: bool | str = True,
     ) -> None:
         """
         Initialize OAuth client.
@@ -140,6 +141,8 @@ def __init__(
             client_id: OAuth client ID
             client_secret: OAuth client secret
             timeout: Request timeout in seconds (default: 30.0)
+            verify: TLS verification, passed through to requests.Session.verify:
+                True (default), False, or a path to a CA bundle.
 
         Raises:
             ConfigurationError: If required parameters are missing
@@ -156,6 +159,7 @@ def __init__(
 
         # Initialize session
         self.session = requests.Session()
+        self.session.verify = verify
 
     def get_authorization_url(
         self,
diff --git a/plane/client/plane_client.py b/plane/client/plane_client.py
index 9907cf7..87e291d 100644
--- a/plane/client/plane_client.py
+++ b/plane/client/plane_client.py
@@ -43,6 +43,7 @@ def __init__(
         base_url: str,
         api_key: str | None = None,
         access_token: str | None = None,
+        verify: bool | str = True,
     ) -> None:
         if not api_key and not access_token:
             raise ConfigurationError(
@@ -57,6 +58,7 @@ def __init__(
             base_path=base_url,
             api_key=api_key,
             access_token=access_token,
+            verify=verify,
         )
 
         self.users = Users(self.config)
diff --git a/plane/config.py b/plane/config.py
index 00136ed..a267eba 100644
--- a/plane/config.py
+++ b/plane/config.py
@@ -23,6 +23,7 @@ def __init__(
         access_token: str | None = None,
         timeout: float | tuple[float, float] | None = 30.0,
         retry: RetryConfig | None = None,
+        verify: bool | str = True,
     ) -> None:
         if not api_key and not access_token:
             raise ConfigurationError(
@@ -38,3 +39,4 @@ def __init__(
         self.access_token = access_token
         self.timeout = timeout
         self.retry = retry
+        self.verify = verify
diff --git a/tests/unit/test_config.py b/tests/unit/test_config.py
new file mode 100644
index 0000000..3e4163b
--- /dev/null
+++ b/tests/unit/test_config.py
@@ -0,0 +1,66 @@
+"""Unit tests for TLS verification config (Configuration.verify / PlaneClient(verify=...)).
+
+These construct clients/config directly and never make network calls, so they
+run without any PLANE_* environment variables.
+"""
+
+from plane.client import PlaneClient
+from plane.client.oauth_client import OAuthClient
+from plane.config import Configuration
+
+
+def test_verify_defaults_to_true() -> None:
+    config = Configuration(base_path="https://api.plane.so", api_key="test-key")
+    assert config.verify is True
+
+
+def test_verify_false_propagates_to_configuration() -> None:
+    config = Configuration(base_path="https://api.plane.so", api_key="test-key", verify=False)
+    assert config.verify is False
+
+
+def test_verify_ca_bundle_path_propagates_verbatim() -> None:
+    ca_path = "/etc/ssl/certs/internal-ca.pem"
+    config = Configuration(base_path="https://api.plane.so", api_key="test-key", verify=ca_path)
+    assert config.verify == ca_path
+
+
+def test_plane_client_verify_defaults_to_true() -> None:
+    client = PlaneClient(base_url="https://api.plane.so", api_key="test-key")
+    assert client.config.verify is True
+    assert client.projects.session.verify is True
+
+
+def test_plane_client_verify_false_propagates_to_session() -> None:
+    client = PlaneClient(base_url="https://api.plane.so", api_key="test-key", verify=False)
+    assert client.config.verify is False
+    assert client.projects.session.verify is False
+
+
+def test_plane_client_verify_ca_bundle_propagates_to_all_resources() -> None:
+    ca_path = "/etc/ssl/certs/internal-ca.pem"
+    client = PlaneClient(base_url="https://api.plane.so", api_key="test-key", verify=ca_path)
+
+    assert client.projects.session.verify == ca_path
+    assert client.work_items.session.verify == ca_path
+    # Sub-resources build their own BaseResource off the same Configuration.
+    assert client.work_items.comments.session.verify == ca_path
+
+
+def test_oauth_client_verify_defaults_to_true() -> None:
+    oauth_client = OAuthClient(
+        base_url="https://api.plane.so",
+        client_id="client-id",
+        client_secret="client-secret",
+    )
+    assert oauth_client.session.verify is True
+
+
+def test_oauth_client_verify_false_propagates_to_session() -> None:
+    oauth_client = OAuthClient(
+        base_url="https://api.plane.so",
+        client_id="client-id",
+        client_secret="client-secret",
+        verify=False,
+    )
+    assert oauth_client.session.verify is False