This is the progression of world record improvements of the 400 metres M50 division of Masters athletics.
| Hand | Auto | Athlete | Nationality | Birthdate | Location | Date | Ref |
|---|---|---|---|---|---|---|---|
| 49.98 | Ricardo Roach Gonzalez | 12 October 1972 | Santiago | 19 October 2024 | |||
| 50.51 | Juan Lopez | 14 May 1970 | Granada | 16 July 2021 | |||
| 50.73 | Roland Gröger | 7 August 1964 | Berlin | 25 June 2017 | |||
| 51.39 | Fred Sowerby | 11 December 1948 | Orlando | 27 August 1999 | |||
| 51.60 | Guido Müller | 22 December 1938 | Hösbach | 3 June 1989 | |||
| 51.81 | Reginald Austin | 16 October 1936 | Melbourne | 4 December 1987 | |||
| 51.8 | Ron Taylor | 4 December 1933 | Swansea | 22 September 1986 | |||
| 52.24 | Ingo Vierk | 1935 | Rome | 29 June 1985 | |||
| 52.28 | Francis Peter Higgins | 16 November 1928 | Hannover | 1 August 1979 | |||
| 52.9 | Jack Greenwood | 5 February 1926 | Gothenburg | 8 August 1977 |