USS General O. H. Ernst (AP-133) was a General G. O. Squier-class transport ship for the U.S. Navy in World War II. She was named in honor of U.S. Army general Oswald Herbert Ernst. She was decommissioned in 1946 and transferred to the Army Transportation Service as USAT General O. H. Ernst. She was sold privately in 1964 and renamed SS Calmar, and was scrapped in 1980.