Mill Lake Boat Ramp is a public boat launch located in Parry Sound, Ontario, situated in the northeastern corner of the city near the Highway 400 bridges that cross the Seguin River.

The ramp is accessed off Hall's Quarry Road and provides entry to Mill Lake, a smaller, cottage-lined lake that does not connect to Georgian Bay or other surrounding lakes in the area.

Because Mill Lake is a self-contained body of water, the launch is best suited for recreational boating, paddling, and fishing within the lake itself rather than as a gateway to broader waterway networks.

Overnight parking at the ramp is available with a permit through the Town of Parry Sound.