The list of ship commissionings in 1921 is a chronological list of ships commissioned in 1921. In cases where no official commissioning ceremony was held, the date of service entry may be used instead. For ships lost at sea, see list of shipwrecks in 1921 instead. __NOTOC__ DateOperatorShipPennantClass and typeNotes May 9 Modified destroyer Scrapped July 17 A-3 SS-4 at Cavite Navy Yard, Philippines, disposed of as a target ship and stricken in 1922 July 25 A-5 SS-6 at Cavite Navy Yard, Philippines, disposed of as a target ship and stricken in 1922 October 6 SP-418 Patrol vessel Tender and houseboat 1924-1933; Sold 1933 November 15 Modified destroyer Scrapped December 1 Seaplane tender and training ship date stricken; later scrapped December 12 Scuttled in 1924 unknown date SP-680 Patrol vessel/minesweeper Sold
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