This is the progression of world record improvements of the 300 metres hurdles W55 division of Masters athletics.
| Hand | Auto | Athlete | Nationality | Birthdate | Age | Location | Date | |
|---|---|---|---|---|---|---|---|---|
| 46.74 | Barbara Gähling | 20 January 1965 | Köln | 8 May 2022 | ||||
| 47.46 | Barbara Gähling | 20 January 1965 | Solingen | 12 June 2021 | ||||
| 48.74 | Susan Frisby | 9 April 1960 | Aarhus | 3 August 2017 | ||||
| 49.00 | Jane Horder | 18 January 1957 | Derby | 21 July 2012 | ||||
| 49.14 | Phil Raschker | 21 February 1947 | Orono | 11 August 2002 | ||||
| 52.11 | Corrie Roovers | 14 July 1935 | Turku | 26 July 1991 | ||||
| 55.40 | Wanda Sakata Dos Santos | 1 June 1932 | Eugene | 3 August 1989 |