John R. Dailey is a retired United States Marine Corps four-star general who served as Assistant Commandant of the Marine Corps (ACMC) and Chief of Staff from 1990 to 1992, Acting Associate Deputy Administrator of the National Aeronautics and Space Administration (NASA) from 1992 to 1999; and director of the National Air and Space Museum (NASM) since 2000.

His career in the Marine Corps spanned thirty-six years and included a wide variety of operational and staff assignments. He is a pilot with over 7000 hours in fixed and rotary wing aircraft. He has extensive command experience including the Marine Corps Systems Command and the Armed Forces Staff College. He flew 450 missions during two tours in Vietnam and has numerous personal decorations which he received for combat operations.