is an American writer. He has written numerous flight-related works of fiction and non-fiction. His works include Jonathan Livingston Seagull (1970) and Illusions: The Adventures of a Reluctant Messiah (1977), both of which were among the 1970s' biggest sellers.

Most of Bach's books have been semi-autobiographical, using actual or fictionalized events from his life to illustrate his philosophy. His books espouse his philosophy that our apparent physical limits and mortality are merely appearance. Bach is noted for his love of aviation and his books related to flying in a metaphorical context. He has flown as a hobby since the age of 17. In late August 2012, Bach was severely injured when on approach to landing at Friday Harbor, Washington, his aircraft clipped some power lines and crashed upside down in a field.