Flat spin may refer to:
- Flat spin, a boomerang-type motion in aviation
- FlatSpin, a 2001 play written by Alan Ayckbourn
- Flat spin, a skateboarding slide maneuver
- Flat spin, a freeskiing jump trick
- Flat spin (roller coaster element), a term used by Bolliger & Mabillard to describe a tight corkscrew