Fastest run 400 metres (male) (indoors)
- Who
- Kerron Clement
- What
- 44.57 second(s)
- Where
- United States (Fayetteville)
- When
- 12 March 2005
The fastest indoor 400 m run by a male athlete is 44.57 seconds, by Kerron Clement (USA, b. Trinidad and Tobago) in Fayetteville, Arkansas, USA, on 12 March 2005. The 19-year-old Clement was competing for the University of Florida at the NCAA Men’s Division I Indoor Track and Field Championships.