List of Welsh records in swimming

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. Records can be set at intermediate distances in an individual race and for the first leg of a relay race.
 * 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 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.