Grindstone Lake may refer to: Grindstone Lake (Kenora District), a lake in Kenora District, Ontario Grindstone Lake (Frontenac County) a lake in Frontenac County, Ontario Grindstone Lake (Muskoka District), a lake in Muskoka District, Ontario Grindstone Lake (Algoma District), a lake in Algoma District, Ontario Grindstone Lake in Montezuma County, Colorado Grindstone Lake in Pine County, Minnesota Grindstone Lake in Sawyer County, Wisconsin Grindstone Pond, a small lake in Franklin County, Maine Grindstone Pond, a small lake in Piscataquis County, Maine Grindstone Reservoir in Crook County, Oregon Grindstone Tank, a small lake in Coconino County, Arizona Grindstone Tank, a small lake in Yavapai County, Arizona Grindstone Tank, a small lake in La Salle County, Texas