Swan Lake (formerly Stevensville) is a hamlet and census designated place in the town of Liberty, Sullivan County, New York, United States.

Swan Lake was originally called Stevensville, named after the Stevens brothers who built a large sole leather tannery there.

[4] Alden S. Swan arrived there from New York about 1895 and by the time of his death in 1917 owned much of the land and all of the lake.

The Bikur Cholim B'nai Israel Synagogue in Swan Lake is listed on the National Register of Historic Places.

The ecology of the lake is of note as the Catskills area is known for its long cultural ties to fishing.

[9] The Moshini Stone Castle is a small park garden within the town near the lake.