This is the progression of world record improvements of the 300 metres hurdles W55 division of Masters athletics.
- Key
Incomplete information Pending
| Hand | Auto | Athlete | Nationality | Birthdate | Age | Location | Date |
|---|---|---|---|---|---|---|---|
| 46.74 | Barbara Gähling |  Germany
|
20 January 1965 | 57 years, 108 days | Köln | 8 May 2022 | |
| 47.46 | Barbara Gähling | Germany
|
20 January 1965 | 56 years, 143 days | Solingen | 12 June 2021 | |
| 48.74 | Susan Frisby |  United Kingdom
|
9 April 1960 | 57 years, 116 days | Aarhus | 3 August 2017 | |
| 49.00 | Jane Horder | United Kingdom
|
18 January 1957 | 55 years, 185 days | Derby | 21 July 2012 | |
| 49.14 | Phil Raschker |  United States
|
21 February 1947 | 55 years, 171 days | Orono | 11 August 2002 | |
| 52.11 | Corrie Roovers |  Netherlands
|
14 July 1935 | 56 years, 12 days | Turku | 26 July 1991 | |
| 55.40 | Wanda Sakata Dos Santos |  Brazil
|
1 June 1932 | 57 years, 63 days | Eugene | 3 August 1989 |