diff --git a/src/pytest_mock/plugin.py b/src/pytest_mock/plugin.py
index 15147bc..b3b97ad 100644
--- a/src/pytest_mock/plugin.py
+++ b/src/pytest_mock/plugin.py
@@ -60,10 +60,15 @@ def __init__(self, config: Any) -> None:
         if hasattr(mock_module, "seal"):
             self.seal = mock_module.seal
 
-    def resetall(self) -> None:
-        """Call reset_mock() on all patchers started by this fixture."""
+    def resetall(self, *, return_value: bool = False, side_effect: bool = False) -> None:
+        """
+        Call reset_mock() on all patchers started by this fixture.
+        
+        :param bool return_value: Reset the return_value of mocks.
+        :param bool side_effect: Reset the side_effect of mocks.
+        """
         for m in self._mocks:
-            m.reset_mock()
+            m.reset_mock(return_value=return_value, side_effect=side_effect)
 
     def stopall(self) -> None:
         """
diff --git a/tests/test_pytest_mock.py b/tests/test_pytest_mock.py
index 55f5ec4..14e01ec 100644
--- a/tests/test_pytest_mock.py
+++ b/tests/test_pytest_mock.py
@@ -177,11 +177,11 @@ def test_mocker_aliases(name: str, pytestconfig: Any) -> None:
 
 
 def test_mocker_resetall(mocker: MockerFixture) -> None:
-    listdir = mocker.patch("os.listdir")
-    open = mocker.patch("os.open")
+    listdir = mocker.patch("os.listdir", return_value="foo")
+    open = mocker.patch("os.open", side_effect=["bar", "baz"])
 
-    listdir("/tmp")
-    open("/tmp/foo.txt")
+    assert listdir("/tmp") == "foo"
+    assert open("/tmp/foo.txt") == "bar"
     listdir.assert_called_once_with("/tmp")
     open.assert_called_once_with("/tmp/foo.txt")
 
@@ -189,6 +189,13 @@ def test_mocker_resetall(mocker: MockerFixture) -> None:
 
     assert not listdir.called
     assert not open.called
+    assert listdir.return_value == "foo"
+    assert list(open.side_effect) == ["baz"]
+    
+    mocker.resetall(return_value=True, side_effect=True)
+    
+    assert isinstance(listdir.return_value, mocker.Mock)
+    assert open.side_effect is None
 
 
 class TestMockerStub: