Chapman Lake is a reservoir located in Warren County, Pennsylvania entirely within the Chapman State Park.

[1] Chapman State Park is a 862 acres (349 ha) state park that opens from sunrise to sunset.

[2] The lake is formed by the disbandment of the West Branch of the Tionesta Creek.

The lake spans 68 acres (28 ha) and has fishing for both warm-water and cold-water fish.

[3] The park is off US 6, near the town of Clarendon.