Frederick Mackay "Fred" Trapnell (July 9, 1902 - January 30, 1975) was a United States Navy admiral and aviation pioneer. Trapnell was the first US Navy pilot to fly a jet aircraft, was considered the best, most experienced naval test aviator of his generation, co-founded the branch's first test pilot school, and played a pivotal role in both the development of future Naval aircraft and the survival of the post-World War II Navy's air arm.