This is the progression of world record improvements of the 300 metres hurdles W50 division of Masters athletics.
| Hand | Auto | Athlete | Nationality | Birthdate | Location | Date |
|---|---|---|---|---|---|---|
| 44.90 | Barbara Gähling | 20.01.1965 | Lyon | 12.08.2015 | ||
| 45.05 | Christine Müller | 22.07.1958 | Ljubljana | 27.07.2008 | ||
| 45.8 | Jan Hynes | 03.04.1944 | Brisbane | 03.09.1994 | ||
| 48.43 | Marjorie Hocknell | 15.11.1943 | Athens | 04.06.1994 | ||
| 49.78 | Brenda Parkinson | 01.02.1937 | Melbourne | 04.12.1987 | ||
| 52.01 | Pirkko Martin | 16.07.1936 | Melbourne | 29.11.1987 | ||