This is the progression of world record improvements of the 400 metres hurdles M50 division of Masters athletics.
- Key
Incomplete information Pending
| Hand | Auto | Athlete | Nationality | Birthdate | Location | Date | Ref |
|---|---|---|---|---|---|---|---|
| 54.91 | Ian Weakley |  United States | 24 February 1974 | Gothenburg | 17 August 2024 | [1] | |
| 54.75 | Ian Weakley | United States | 24 February 1974 | Berea | 16 July 2024 | ||
| 55.99 | Toine van Beckhoven |  Netherlands | 1 January 1970 | Eindhoven | 21 May 2023 | ||
| 56.35 | Mattias Sunneborn |  Sweden | 27 September 1970 | Sollentuna | 13 June 2021 | ||
| 56.56 | Howard Moscrop |  Great Britain | 16 December 1957 | Birmingham | 5 July 2008 | ||
| 58.1 | Jack Greenwood | United States | 5 February 1926 | Gresham | 3 July 1976 |