USS Diomedes (ARB-11) was an Aristaeus-class repair ship built for the United States Navy during World War II.

Named for Diomedes (in Greek mythology, a prince of Argos, one of the bravest heroes of the Trojan War), she was the only U.S.

LST-1119 was launched on 11 January 1945 by the Chicago Bridge and Iron Company of Seneca, Illinois; sponsored by Mrs. M. D. Hembree; placed in partial commission from 23 January to 21 February 1945 for the passage to Baltimore, Maryland; converted to a battle damage repair ship as USS Diomedes (ARB-11); and commissioned on 23 June 1945.

Diomedes arrived at Okinawa on 25 September, and on 3 October got underway for Hong Kong to provide repair services.

Departing Taku on 20 March 1946 Diomedes called at Pearl Harbor, and arrived at Charleston, South Carolina on 28 May.