USS Porpoise has been the name of more than one United States navy ship, and may refer to:
, a schooner built in 1820 and wrecked in 1833, a brig in commission from 1836 to 1847, from 1848 to 1852, and from 1853 until lost in 1854, a submarine commission from 1903 to 1919, renamed USS A-6 in 1911

• USS Porpoise (YFB-2047), steamer in commission from 1918 to 1930, originally named , a submarine in commission from 1935 to 1945

Also

• A patrol vessel named may have served ca. 1917-1919, but no records of her acquisition, commissioning, or service have been found