USS Bullfinch (AM-66) was a Bullfinch-class minesweeper of the United States Navy during World War II.

Bullfinch was assigned to special duty with the Mine Warfare School at Yorktown, Virginia.

Except for one cruise up Chesapeake Bay to visit Baltimore, Maryland, the minesweeper restricted her operations to the waters around Norfolk and Yorktown.

She continued minesweeping and mine warfare training duties until decommissioned at Yorktown on 15 September 1944.

On 28 August 1945, she was transferred to the Maritime Commission's War Shipping Administration at Little Creek, Virginia, for disposal.