This is the progression of world record improvements of the 400 metres M40 division of Masters athletics.
| Hand | Auto | Athlete | Nationality | Birthdate | Location | Date |
|---|---|---|---|---|---|---|
| 47.82 | Enrico Saraceni | 19.05.1964 | Arhus | 25.07.2004 | ||
| 47.86 | Eric Roeske | 26.09.1960 | Potsdam | 21.08.2002 | ||
| 47.87 | Manuel Ulacio | 1940 | Santiago | 11.04.1981 | ||
| 49.57 | Bruno Bianchi | 08.01.1939 | Hannover | 01.07.1979 | ||
| 49.5 | Noel Clough | 25.04.1937 | Gothenburg | 08.08.1977 | ||
| 49.7 | John Dixon | 15.03.1932 | Crystal Palace, London | 22.06.1973 | ||