Mohawk Island is a small island in Lake Erie in the province of Ontario, Canada. It was formerly known as Gull Island. The island contains the ruins of the Gull Island Lighthouse, built in 1848 and decommissioned in 1969. It is located close to the shore of Rock Point Provincial Park.
Currently, no humans live on the island, and it is mostly inhabited by birds. It is an important nesting and loafing area for gulls, terns and cormorants. The Canadian government does not encourage people to visit Mohawk Island, as it has been set aside to protect nesting birds. No visits are permitted during nesting season, which is defined as from April 1 to July 31.