Sun ’n Fun Aerospace Expo (officially styled SUN 'n FUN) is a nonprofit organization in Lakeland, Florida dedicated to the promotion of aviation education. It is best known for the annual week-long fly-in and airshow at Lakeland Linder International Airport in Lakeland, Florida, usually held during late March or early April.

Previously called the 'Sun ’n Fun International Fly-In and Expo, for 2020 the event was officially renamed the Sun ’n Fun Aerospace Expo in April 2019. In addition to the fly-in, at one time Sun 'n Fun also operated the Florida Air Museum and supported the Central Florida Aerospace Academy—an aviation-focused career academy operated by the Polk County School Board as part of Kathleen High School. In October 2019 a reorganization made the fly-in part of the Aerospace Center for Excellence, a non-profit organization that was established in 2014 to provide young students with science, technology, engineering and mathematics (STEM) instruction