Five ships of the United States Navy have been named Decatur, in honor of Commodore Stephen Decatur.

• , was a sloop-of-war built in 1839 and in service from 1840 to 1859.

• , was a which served mainly in or near the Philippines from 1902 to 1919.

• , was a which served from 1922 to 1945.

• , was a in service from 1956 to 1983, later converted to become the first Self Defense Test Ship.

• , is an commissioned in 1998 and currently in active service.