diff --git a/data_diff/sqeleton/databases/_connect.py b/data_diff/sqeleton/databases/_connect.py
index 04baa413..2d2314fa 100644
--- a/data_diff/sqeleton/databases/_connect.py
+++ b/data_diff/sqeleton/databases/_connect.py
@@ -106,7 +106,7 @@ def load_mixins(self, *abstract_mixins: AbstractMixin) -> Self:
         database_by_scheme = {k: db.load_mixins(*abstract_mixins) for k, db in self.database_by_scheme.items()}
         return type(self)(database_by_scheme)
 
-    def connect_to_uri(self, db_uri: str, thread_count: Optional[int] = 1) -> Database:
+    def connect_to_uri(self, db_uri: str, thread_count: Optional[int] = 1, **kwargs) -> Database:
         """Connect to the given database uri
 
         thread_count determines the max number of worker threads per database,
@@ -149,7 +149,7 @@ def connect_to_uri(self, db_uri: str, thread_count: Optional[int] = 1) -> Databa
                 conn_dict = config["database"][database]
             except KeyError:
                 raise ValueError(f"Cannot find database config named '{database}'.")
-            return self.connect_with_dict(conn_dict, thread_count)
+            return self.connect_with_dict(conn_dict, thread_count, **kwargs)
 
         try:
             matcher = self.match_uri_path[scheme]
@@ -174,7 +174,7 @@ def connect_to_uri(self, db_uri: str, thread_count: Optional[int] = 1) -> Databa
 
             if scheme == "bigquery":
                 kw["project"] = dsn.host
-                return cls(**kw)
+                return cls(**kw, **kwargs)
 
             if scheme == "snowflake":
                 kw["account"] = dsn.host
@@ -194,13 +194,13 @@ def connect_to_uri(self, db_uri: str, thread_count: Optional[int] = 1) -> Databa
         kw = {k: v for k, v in kw.items() if v is not None}
 
         if issubclass(cls, ThreadedDatabase):
-            db = cls(thread_count=thread_count, **kw)
+            db = cls(thread_count=thread_count, **kw, **kwargs)
         else:
-            db = cls(**kw)
+            db = cls(**kw, **kwargs)
 
         return self._connection_created(db)
 
-    def connect_with_dict(self, d, thread_count):
+    def connect_with_dict(self, d, thread_count, **kwargs):
         d = dict(d)
         driver = d.pop("driver")
         try:
@@ -210,9 +210,9 @@ def connect_with_dict(self, d, thread_count):
 
         cls = matcher.database_cls
         if issubclass(cls, ThreadedDatabase):
-            db = cls(thread_count=thread_count, **d)
+            db = cls(thread_count=thread_count, **d, **kwargs)
         else:
-            db = cls(**d)
+            db = cls(**d, **kwargs)
 
         return self._connection_created(db)
 
@@ -220,7 +220,9 @@ def _connection_created(self, db):
         "Nop function to be overridden by subclasses."
         return db
 
-    def __call__(self, db_conf: Union[str, dict], thread_count: Optional[int] = 1, shared: bool = True) -> Database:
+    def __call__(
+        self, db_conf: Union[str, dict], thread_count: Optional[int] = 1, shared: bool = True, **kwargs
+    ) -> Database:
         """Connect to a database using the given database configuration.
 
         Configuration can be given either as a URI string, or as a dict of {option: value}.
@@ -234,6 +236,8 @@ def __call__(self, db_conf: Union[str, dict], thread_count: Optional[int] = 1, s
             db_conf (str | dict): The configuration for the database to connect. URI or dict.
             thread_count (int, optional): Size of the threadpool. Ignored by cloud databases. (default: 1)
             shared (bool): Whether to cache and return the same connection for the same db_conf. (default: True)
+            bigquery_credentials (google.oauth2.credentials.Credentials): Custom Google oAuth2 credential for BigQuery.
+            (default: None)
 
         Note: For non-cloud databases, a low thread-pool size may be a performance bottleneck.
 
@@ -263,9 +267,9 @@ def __call__(self, db_conf: Union[str, dict], thread_count: Optional[int] = 1, s
                     return conn
 
         if isinstance(db_conf, str):
-            conn = self.connect_to_uri(db_conf, thread_count)
+            conn = self.connect_to_uri(db_conf, thread_count, **kwargs)
         elif isinstance(db_conf, dict):
-            conn = self.connect_with_dict(db_conf, thread_count)
+            conn = self.connect_with_dict(db_conf, thread_count, **kwargs)
         else:
             raise TypeError(f"db configuration must be a URI string or a dictionary. Instead got '{db_conf}'.")
 
diff --git a/data_diff/sqeleton/databases/bigquery.py b/data_diff/sqeleton/databases/bigquery.py
index d54e541b..2c0a57ca 100644
--- a/data_diff/sqeleton/databases/bigquery.py
+++ b/data_diff/sqeleton/databases/bigquery.py
@@ -210,8 +210,8 @@ class BigQuery(Database):
     CONNECT_URI_PARAMS = ["dataset"]
     dialect = Dialect()
 
-    def __init__(self, project, *, dataset, **kw):
-        credentials = None
+    def __init__(self, project, *, dataset, bigquery_credentials=None, **kw):
+        credentials = bigquery_credentials
         bigquery = import_bigquery()
 
         keyfile = kw.pop("keyfile", None)