This is the progression of world record improvements of the 400 metres W55 division of Masters athletics.
- Key
Incomplete information Pending
| Hand | Auto | Athlete | Nationality | Birthdate | Location | Date |
|---|---|---|---|---|---|---|
| 59.36 | Julie Brims |  Australia | 7 January 1966 | Brisbane | 23 January 2021 | |
| 1:00.56 | Marie Mathieu |  Puerto Rico | 26 November 1956 | Porto Alegre | 26 October 2013 | |
| 1:01.56 | Caroline Ann Powell |  United Kingdom | 21 December 1953 | Yeovil | 9 September 2012 | |
| 1:02.34 | Joylyn Saunders Mullins | United Kingdom | 27 November 1952 | Lahti | 28 July 2009 | |
| 1:02.40 | Avril Douglas |  Canada | 1 August 1946 | Toronto | 25 August 2001 | |
| 1:04.2 | Anne Stobaus | Australia | 6 July 1941 | Aberfeldie | 16 November 1996 | |
| 1:04.50 | Brunhilde Hoffmann |  Germany | 17 August 1939 | Buffalo | 22 July 1995 | |
| 1:05.29 | Kemisole Solwazi |  United States | 20 October 1939 | 8 April 1995 | ||
| 1:05.48 | Carolyn Sue Cappetta | United States | 1936 | Turku | 18 July 1991 | |
| 1:08.26 | Josefina Garcia de Schultz |  Venezuela | 14 December 1933 | 1990 | ||
| 1:08.41 | Irene Obera | United States | 7 December 1933 | San Diego | 20 July 1989 |