Grindstone Creek is a stream in the Unorganized North Part of Algoma District in Northeastern Ontario, Canada.

[1][2][3][4] It is in the Great Lakes Basin and is a left tributary of the Mississagi River.

The stream begins at an unnamed lake in geographic Rioux Township.

The Mississagi River flows to the North Channel on Lake Huron.

This article related to a river in Northern Ontario, Canada is a stub.