American 21-inch torpedo
There have been a number of 21-inch torpedoes in service with the United States. These have been used on ships and submarines of the U.S. Navy. American 21-inch torpedoes are in diameter.
Ship classes that carried 21-inch torpedoes include:
- Allen M. Sumner-class destroyers
- Atlanta-class cruisers
- Bagley-class destroyers
- Balao-class submarines
- Barbel-class submarines
- Barracuda-class submarines
- Benham-class destroyers
- Benjamin Franklin-class submarines
- Benson-class destroyers
- Cachalot-class submarines
- Caldwell-class destroyers
- Cassin-class destroyers
- Chester-class cruisers
- Clemson-class destroyers
- Colorado-class battleships
- Connecticut-class battleships
- Dealey-class destroyer escorts
- Ethan Allen-class submarines
- Farragut-class destroyers
- Forrest Sherman-class destroyers
- Fletcher-class destroyers
- Gato-class submarines
- Gearing-class destroyers
- George Washington-class submarines
- Gleaves-class destroyers
- Glenard P. Lipscomb-class submarine
- Grayback-class submarines
- Gridley-class destroyers
- Halibut-class submarine
- James Madison-class submarines
- John C. Butler-class destroyer escorts
- Lafayette-class submarines
- Lexington-class battlecruisers - canceled
- Los Angeles-class submarines
- Mahan-class destroyers
- Mitscher-class destroyer leaders
- Narwhal-class submarine
- Nautilus-class submarine
- Norfolk-class destroyer leader
- O'Brien-class destroyers
- Ohio-class submarines
- Omaha-class cruisers
- Permit-class submarines
- Porter-class destroyers
- PT boats
- R-class submarines
- Rudderow-class destroyer escorts
- S-class submarines
- Sailfish-class submarines
- Sampson-class destroyers
- Sargo-class submarines
- Seawolf-class submarine (1957)
- Seawolf-class submarines (1997)
- Sims-class destroyers
- Skate-class submarines
- Skipjack-class submarines
- Somers-class destroyers
- South Dakota-class battleships - canceled
- Sturgeon-class submarines
- T-1-class submarines
- Tambor-class submarines
- Tang-class submarines
- Tench-class submarines
- Tennessee-class cruisers
- Tucker-class destroyers
- Tullibee-class submarine
- V-boat submarines
- Virginia-class battleships
- Virginia-class submarines
- Wickes-class destroyers
| Name | Country | In service date | Platform / target | Dimensions | Warhead | Propulsion | Performance |
| Mark 1 (Bliss-Leavitt) |  USconvert|21|in|cm|abbr=onconvert|16.4|ft|m|abbr=onconvert|1500|lb|kg|abbr=onconvert|200|lb|kg|abbr=onconvert|27|kn|km/h|abbr=onconvert |4000|yd|km|abbr=on |