USS Santa Rosalia (ID-1503) was a United States Navy cargo ship in commission from 1918 to 1919. SS Santa Rosalia was built at Port Glasgow, Scotland, by William Hampton and Company, Ltd. as a commercial cargo ship. Launched on 21 September 1911, she was completed in October 1911. The United States Steel Products Company of New York City purchased her in 1914. After the United States entered World War I in 1917, the U.S. Navy inspected her for possible naval service sometime in 1917 or 1918. The United States Shipping Board chartered Santa Rosalia for World War I service on 20 May 1918 and transferred her to U.S. Navy control. The Navy assigned her the naval registry Identification Number (Id. No.) 1503 and commissioned her the same day as USS Santa Rosalia at New Orleans, Louisiana.