USS Adder
| Adder running trials in Long Island Sound, 1903 | |
| History | |
|---|---|
| United States | |
| Name | Adder | 
| Namesake | Vipera berus | 
| Ordered | 7 June 1900 | 
| Awarded | 25 August 1900 | 
| Builder | |
| Laid down | 3 October 1900 | 
| Launched | 22 July 1901 | 
| Sponsored by | Mrs. Jane S. Wainwright | 
| Commissioned | 12 January 1903 | 
| Decommissioned | 26 July 1909 | 
| Commissioned | 10 February 1910 | 
| Decommissioned | 12 December 1919 | 
| Renamed | A-2 (Submarine Torpedo Boat No. 3), 17 November 1911 | 
| Stricken | 16 January 1922 | 
| Identification | Hull symbol:SS-3, 17 July 1920 | 
| Fate | Designated for use as a target, 24 September 1920 and expended mid-January 1922 | 
| General characteristics | |
| Class & type | Plunger-class submarine | 
| Displacement | 
 | 
| Length | 63 ft 10 in (19.46 m) | 
| Beam | 11 ft 11 in (3.63 m) | 
| Draft | 10 ft 7 in (3.23 m) | 
| Installed power | 
 | 
| Propulsion | 
 | 
| Speed | 
 | 
| Test depth | 150 ft (45.7 m) | 
| Complement | 7 officers and enlisted | 
| Armament | 1 × bow 18 inch (450 mm) torpedo tube | 
| Armor | Conning tower#Submarines: 3+5⁄8 in (92 mm) | 
USS Adder (Submarine Torpedo Boat No. 3), later renamed A-2, was one of seven Plunger-class submarines built for the United States Navy (USN) in the first decade of the 20th century.