diff --git a/dlt/sources/helpers/rest_client/auth.py b/dlt/sources/helpers/rest_client/auth.py
index d2ca1c1ca6..1b8e1833d3 100644
--- a/dlt/sources/helpers/rest_client/auth.py
+++ b/dlt/sources/helpers/rest_client/auth.py
@@ -1,6 +1,5 @@
 import math
 import dataclasses
-from abc import abstractmethod
 from base64 import b64encode
 from typing import (
     TYPE_CHECKING,
@@ -17,6 +16,7 @@
 from typing_extensions import Annotated
 from requests.auth import AuthBase
 from requests import PreparedRequest, Session as BaseSession  # noqa: I251
+from abc import abstractmethod
 
 from dlt.common import logger
 from dlt.common.exceptions import MissingDependencyException
@@ -46,6 +46,15 @@ def __bool__(self) -> bool:
         # to be evaluated as False in requests.sessions.Session.prepare_request()
         return True
 
+    def mask_secret(self, secret: Optional[str]) -> str:
+        if secret is None:
+            return "None"
+        return f"{secret[0]}*****{secret[-1]}"
+
+    @abstractmethod
+    def mask_secrets(self) -> str:
+        pass
+
 
 @configspec
 class BearerTokenAuth(AuthConfigBase):
@@ -67,6 +76,9 @@ def __call__(self, request: PreparedRequest) -> PreparedRequest:
         request.headers["Authorization"] = f"Bearer {self.token}"
         return request
 
+    def mask_secrets(self) -> str:
+        return self.mask_secret(self.token)
+
 
 @configspec
 class APIKeyAuth(AuthConfigBase):
@@ -95,6 +107,9 @@ def __call__(self, request: PreparedRequest) -> PreparedRequest:
             raise NotImplementedError()
         return request
 
+    def mask_secrets(self) -> str:
+        return self.mask_secret(self.api_key)
+
 
 @configspec
 class HttpBasicAuth(AuthConfigBase):
@@ -117,10 +132,16 @@ def parse_native_representation(self, value: Any) -> None:
         )
 
     def __call__(self, request: PreparedRequest) -> PreparedRequest:
-        encoded = b64encode(f"{self.username}:{self.password}".encode()).decode()
+        encoded = b64encode(self._format().encode()).decode()
         request.headers["Authorization"] = f"Basic {encoded}"
         return request
 
+    def mask_secrets(self) -> str:
+        return self.mask_secret(self._format())
+
+    def _format(self) -> str:
+        return f"{self.username}:{self.password}"
+
 
 @configspec
 class OAuth2AuthBase(AuthConfigBase):
@@ -143,6 +164,9 @@ def __call__(self, request: PreparedRequest) -> PreparedRequest:
         request.headers["Authorization"] = f"Bearer {self.access_token}"
         return request
 
+    def mask_secrets(self) -> str:
+        return self.mask_secret(self.access_token)
+
 
 @configspec
 class OAuth2ClientCredentials(OAuth2AuthBase):
@@ -213,6 +237,15 @@ def parse_expiration_in_seconds(self, response_json: Any) -> int:
     def parse_access_token(self, response_json: Any) -> str:
         return str(response_json.get("access_token"))
 
+    def mask_secrets(self) -> str:
+        return str(
+            {
+                "access_token": self.mask_secret(self.access_token),
+                "client_id": self.mask_secret(self.client_id),
+                "client_secret": self.mask_secret(self.client_secret),
+            }
+        )
+
 
 @configspec
 class OAuthJWTAuth(BearerTokenAuth):
diff --git a/tests/sources/helpers/rest_client/test_client.py b/tests/sources/helpers/rest_client/test_client.py
index 8fafde60d9..791e6fa92b 100644
--- a/tests/sources/helpers/rest_client/test_client.py
+++ b/tests/sources/helpers/rest_client/test_client.py
@@ -155,6 +155,35 @@ def response_hook(response: Response, *args: Any, **kwargs: Any) -> None:
         pages = list(pages_iter)
         assert pages == []
 
+    def test_auth_masks_bearer_token(self):
+        auth = BearerTokenAuth(cast(TSecretStrValue, "test-token"))
+        assert auth.mask_secrets() == "t*****n"
+
+    def test_auth_masks_api_key(self):
+        auth = APIKeyAuth(api_key=cast(TSecretStrValue, "test-token"))
+        assert auth.mask_secrets() == "t*****n"
+
+    def test_auth_masks_http_basic(self):
+        auth = HttpBasicAuth("a_user", cast(TSecretStrValue, "test-token"))
+        assert auth.mask_secrets() == "a*****n"
+
+    def test_auth_masks_oauth2(self):
+        auth = OAuth2ClientCredentials(
+            access_token_url=cast(TSecretStrValue, "https://api.example.com/oauth/token"),
+            client_id=cast(TSecretStrValue, "test-client-id"),
+            client_secret=cast(TSecretStrValue, "test-client-secret"),
+            session=Client().session,
+        )
+
+        assert auth.mask_secrets() == str(
+            {"access_token": "None", "client_id": "t*****d", "client_secret": "t*****t"}
+        )
+
+        auth.access_token = cast(TSecretStrValue, "test-token")
+        assert auth.mask_secrets() == str(
+            {"access_token": "t*****n", "client_id": "t*****d", "client_secret": "t*****t"}
+        )
+
     def test_basic_auth_success(self, rest_client: RESTClient):
         response = rest_client.get(
             "/protected/posts/basic-auth",
@@ -349,6 +378,9 @@ def __call__(self, request: PreparedRequest) -> PreparedRequest:
                 request.headers["Authorization"] = f"Bearer {self.token}"
                 return request
 
+            def mask_secrets(self) -> str:
+                return self.mask_secret(self.token)
+
         class CustomAuthAuthBase(AuthBase):
             def __init__(self, token: str):
                 self.token = token
@@ -357,6 +389,8 @@ def __call__(self, request: PreparedRequest) -> PreparedRequest:
                 request.headers["Authorization"] = f"Bearer {self.token}"
                 return request
 
+
+
         auth_list = [
             CustomAuthConfigBase("test-token"),
             CustomAuthAuthBase("test-token"),