USS Flatley (FFG-21) was the thirteenth ship of the Oliver Hazard Perry class of guided-missile frigates.

She was the first ship of the U.S. Navy to be named for Vice Admiral James H. Flatley (1906–1958), a leading Naval Aviation tactician from World War II who flew the Grumman F4F Wildcat in the Battle of Coral Sea and subsequently commanded the VF-10 Grim Reapers taking them into combat for the first time.

Ordered from Bath Iron Works on 28 February 1977 as part of the FY77 program, Flatley's keel was laid down on 13 November 1979.

The ship immediately underwent conversion into a Turkish G-class frigate.

[citation needed] This article includes information collected from the Naval Vessel Register, which, as a U.S. government publication, is in the public domain.