Gerald Carthrae Thomas (October 29, 1894 – April 7, 1984) was a United States Marine Corps general who served as Assistant Commandant of the Marine Corps. He retired from the Marine Corps in 1956 with more than 38 years of distinguished service which included duty on four continents, spanning two World Wars, Haiti and the Korean War. During World War I, he fought in major offensives, including the Battle of Belleau Wood, and was awarded the Silver Star and the Purple Heart.