USS Diploma (AM-221) was an Admirable-class minesweeper built for the United States Navy during World War II.

She was stricken in 2000, in 2004 she was cleaned of contaminants and sunk as an artificial reef on the west coast of Isla Espiritu Santo, off La Paz BCS, Mexico.

Diploma was underway from Pearl Harbor 23 February for Ulithi where she conducted minesweeping exercises in preparation for the invasion of Okinawa.

After the cessation of hostilities she continued sweeping in the East China Sea-Ryukyus area and in the Tsugaru Straits into Ominato Naval Base at the northern tip of Honshū.

She was stricken in 2000, in 2004 she was cleaned of contaminants and sunk as an artificial reef on the west coast of Isla Espiritu Santo, off La Paz BCS, Mexico.