List of Welsh records in swimming
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Welsh records in swimming are ratified by Wales' governing body in swimming, Swim Wales. Records can be set in long course (50 metres) or short course (25 metres) swimming pools, with records currently recorded in the following events for both men and women.
- Freestyle: 50 m, 100 m, 200 m, 400 m, 800 m, 1500 m
- Backstroke: 50 m, 100 m, 200 m
- Breaststroke: 50 m, 100 m, 200 m
- Butterfly: 50 m, 100 m, 200 m
- Individual medley: 100 m (short course only), 200 m, 400 m
- Relays: 4 × 100 m freestyle, 4 × 200 m freestyle, 4 × 100 m medley
Records can be set at intermediate distances in an individual race and for the first leg of a relay race.
Records which have not yet been fully ratified are marked with a '#' symbol in these lists, and all records were achieved in finals unless otherwise noted.
Men
| Event | Time | Name | Club | Date | Meet | Location | Ref | |
|---|---|---|---|---|---|---|---|---|
| 50 m freestyle | 21.83 | Matthew Richards | Millfield | 6 April 2024 | British Championships | London, United Kingdom | ||
| 100 m freestyle | 47.45 | Matthew Richards |  Great Britain |
27 July 2023 | World Championships | Fukuoka, Japan | [1] | |
| 200 m freestyle | 1:44.30 | Matthew Richards | Great Britain |
25 July 2023 | World Championships | Fukuoka, Japan | [2] | |
| 400 m freestyle | 3:45.24 | David Davies | City of Cardiff | 16 March 2009 | British Championships | Sheffield, United Kingdom | ||
| 800 m freestyle | ||||||||
| 1500 m freestyle | ||||||||
| 50 m backstroke | ||||||||
| 100 m backstroke | ||||||||
| 200 m backstroke | ||||||||
| 50 m breaststroke | ||||||||
| 100 m breaststroke | ||||||||
| 200 m breaststroke | ||||||||
| 50 m butterfly | ||||||||
| 100 m butterfly | ||||||||
| 200 m butterfly | ||||||||
| 200 m individual medley | ||||||||
| 400 m individual medley | ||||||||
| 4×100 m freestyle relay | ||||||||
| 4×200 m freestyle relay | ||||||||
| 4×100 m medley relay |
Legend: # – Record awaiting ratification by Swim Wales; WR – World record; ER – European record; CR – Commonwealth record;
Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; so – swim-off; tt – time trial
Records not set in finals: h – heat;
Women
| Event | Time | Name | Club | Date | Meet | Location | Ref | |
|---|---|---|---|---|---|---|---|---|
| 50 m freestyle | 24.72 | Theodora Taylor | Great Britain |
24 August 2025 | World Junior Championships | Otopeni, Romania | ||
| 100 m freestyle | 54.20 | Theodora Taylor | Great Britain |
21 August 2025 | World Junior Championships | Otopeni, Romania | ||
| 200 m freestyle | 1:56.88 | Jazmin Carlin | Bath University | 18 April 2015 | British Championships | London, United Kingdom | ||
| 400 m freestyle | ||||||||
| 800 m freestyle | ||||||||
| 1500 m freestyle | 15:47.26 | Jazmin Carlin | Swansea University | 28 June 2013 | World Championships Trials | Sheffield, United Kingdom | [3] | |
| 50 m backstroke | ||||||||
| 100 m backstroke | ||||||||
| 200 m backstroke | ||||||||
| 50 m breaststroke | ||||||||
| 100 m breaststroke | ||||||||
| 200 m breaststroke | ||||||||
| 50 m butterfly | ||||||||
| 100 m butterfly | ||||||||
| 200 m butterfly | ||||||||
| 200 m individual medley | ||||||||
| 400 m individual medley | ||||||||
| 4×100 m freestyle relay | ||||||||
| 4×200 m freestyle relay | ||||||||
| 4×100 m medley relay |
Legend: # – Record awaiting ratification by Swim Wales; WR – World record; ER – European record; CR – Commonwealth record;
Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; so – swim-off; tt – time trial
Records not set in finals: h – heat;