Four ships of the United States Navy have been named USS Idaho in honor of the 43rd state.

• The first USS Idaho, 8 was a wooden steam sloop later converted to a full-rigged sailing ship.
• The second USS Idaho (BB-24), a Mississippi-class battleship, missed sailing with the Great White Fleet, saw little action during World War I, was sold to Greece and sunk early in World War II.
• The third USS Idaho (SP-545) , a motor boat, was chartered for harbor entrance patrol and submarine net patrol in the Cape May and Philadelphia, Pennsylvania, areas during World War I.
• The fourth USS Idaho (BB-42), a New Mexico-class battleship, saw action in World War II.