|United States D-class submarine|
|Builders:||Fore River Shipbuilding, Quincy, Massachusetts|
|Operators:||United States Navy|
|Preceded by:||C class|
|Succeeded by:||E class|
|Built:||April 1909–September 1910|
|In commission:||November 1909–March 1922|
|Displacement:||288 long tons (293 t)|
|Length:||134 ft 10 in (41.10 m)|
|Beam:||13 ft 11 in (4.24 m)|
|Draft:||11 ft 8 in (3.56 m)|
|Speed:||13 knots (24 km/h; 15 mph)|
|Complement:||15 officers and men|
|Armament:||4 × 18 in (457 mm) torpedo tubes|
The D-class submarines were a class of three United States Navy submarines, built by the Fore River Shipbuilding Company of Quincy, Massachusetts, under a subcontract from the Electric Boat Company of Groton, Connecticut. All three ships served during World War I providing training for crews and officers, before the class was decommissioned, and sold for scrap in 1922.
- USS D-1 (SS-17) was launched in 8 September 1909 and was commissioned on 23 November 1909 as Narwhal. It was decommissioned on 8 February 1922 and sold afterwards.
- USS D-2 (SS-18) was launched in 16 June 1909 and was commissioned on 23 November 1909 as Grayling. It was decommissioned on 18 January 1922 and sold afterwards.
- USS D-3 (SS-19) was launched in 12 March 1910 and was commissioned on 8 September 1910 as Salmon. It was decommissioned on 20 March 1922 and sold afterwards.
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