Brigadier General Dion Williams (December 15, 1869 – December 11, 1952) was an officer in the United States Marine Corps. He was the Assistant Commandant of the Marine Corps from August 1, 1925 — July 1, 1928. During his early career, Williams pioneered the first conceptual study of amphibious reconnaissance in the United States and becoming one of the strongest advocates in having the Marine Corps assume the amphibious, expeditionary role. During his career, he fought guerrillas in the Philippines and Dominican Republic during the Spanish–American War.