USS Altamaha (AVG-18/ACV-18/CVE-18) was an escort aircraft carrier in the United States Navy during World War II. She was named for the Altamaha River in Georgia. Altamaha was laid down under a Maritime Commission contract (MC hull 235) on 19 December 1941 at Tacoma, Washington, by the Seattle-Tacoma Shipbuilding Corporation; launched on 25 May 1942; sponsored by Mrs. Thomas S. Combs, the wife of Commander Combs, who was the commanding officer of Casco, and commissioned on 15 September 1942 Captain J. R. Tate in command.