| Oastler Lake Provincial Park | |
| Map: | Canada Southern Ontario |
| Coords: | 45.3125°N -79.9639°W |
| Coords Ref: | [1] |
| Area: | 32ha |
| Url: | http://www.ontarioparks.com/park/oastlerlake |
Oastler Lake Provincial Park is a provincial park in the municipality of Seguin, Parry Sound District in Central Ontario, Canada. The nearest town, just to the northwest, is Parry Sound.
Oastler Lake is a recreation-class park, 32ha in size, on the shore of Oastler Lake where the Boyne River flows in from Otter Lake. It is located along a former alignment of Highway 69 which now has the street name Oastler Park Drive.