Marine Fighter Squadron 123 (VMF-123) was a fighter squadron of the United States Marine Corps during World War II and later in the Marine Forces Reserve. Known as the “Flying Eight Balls,” the squadron fought at Guadalcanal, Iwo Jima, and Okinawa and served as a training squadron for replacement pilots during the Korean War. The squadron was decommissioned on October 31, 1965 at Naval Air Station Los Alamitos.