- Louis Sanford
- 1:28:57 hour(s):minute(s):second(s)
- United Kingdom (Dorney)
The fastest half marathon dressed as a clown is 1 hr 28 min 57 sec, and was achieved by Louis Sanford (UK) in Dorney, United Kingdom, on 17 November 2018.
This record attempt took place at the Eton Dorney Half Marathon in Buckinghamshire. Louis' children chose the clown costume for the attempt.