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

• USS Idaho (1864) was a wooden steam sloop later converted to a full-rigged sailing ship
• USS Idaho (BB-24), a Mississippi-class battleship, was launched on 9 December 1905 and was sold to Greece on 30 July 1914
• USS Idaho (SP-545) was a motor boat acquired by the US Navy in June 1917 and returned to her owner 30 November 1918
• USS Idaho (BB-42) was a New Mexico-class battleship launched on 30 June 1917, saw action in World War II, and was sold for scrap 24 November 1947
• USS Idaho (SSN-799) is a Virginia-class submarine currently authorized for construction

• SS Gem State, an auxiliary Keystone State-class crane ship launched in 1965 and in ready reserve since 1984.

This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.