USS Mahopac may refer to:
, was an armored monitor launched 17 May 1864 and sold 25 March 1902
, was a tugboat launched 27 May 1919 and decommissioned 12 September 1946
, was a tugboat originally launched as ATA-196 21 December 1944, renamed Mahopac 16 July 1948 and transferred to Taiwan in 1976