The first USS Sierra (ID-1634) was a troop transport of the United States Navy that served during World War I and its immediate aftermath.

SS Sierra was constructed as a commercial passenger ship in 1900 by William Cramp & Sons in Philadelphia for the San Francisco to Australia service via Hawaii of the Oceanic Steamship Company.

[4] The U.S. Navy acquired her from the John D. Spreckel Brothers Company in San Francisco, California, on 27 May 1918 for use as a troop transport during World War I and assigned her the identification number 1634.

Sierra was assigned to transatlantic service upon commissioning, and she transported troops from the United States to France until the end of World War I on 11 November 1918.

After the war, she engaged in the reverse process of bringing American troops home from Europe for another eleven months.