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