USS Cor Caroli (AK-91) was a Crater-class cargo ship commissioned by the US Navy for service in World War II and manned by a US Coast Guard crew.

Cor Caroli was launched 19 March 1943 as SS Betsy Ross, MCE hull 476, by Permanente Metals Corporation, Yard No.

[4] After coastwise cargo operations, Cor Caroli cleared San Diego, California, 14 June 1943, for Auckland, New Zealand, arriving 18 July.

She ferried among Philippine ports between 13 July and 4 August, when she sailed for Guadalcanal, Espiritu Santo, Pearl Harbor, and San Pedro, California.

[4] She entered the National Defense Reserve Fleet, James River Group, Lee Hall, Virginia, the same day.