At the 1948 Summer Olympics in London, 11 swimming events were contested, six for men and five for women. All swimming events took place at the Empire Pool. There was a total of 249 participants from 34 countries competing.
Medal table
Medal summary Men's events 100 m freestyle 57.3 (OR) 57.8 58.1 400 m freestyle 4:41.0 (OR) 4:43.4 4:47.7 1500 m freestyle 19:18.5 19:31.3 19:43.2 100 m backstroke 1:06.4 1:06.5 1:07.8 200 m breaststroke 2:39.3 (OR) 2:40.2 2:43.9 4 × 200 metre freestyle relay Wally RisJimmy McLaneWally WolfBill Smith 8:46.0 (WR) Elemér SzatmáriGyörgy MitróImre NyékiGéza Kádas 8:48.4 Joseph BernardoRené CornuHenri Padou, Jr.Alexandre Jany 9:08.0
Women's events 100 m freestyle 1:06.3 1:06.5 1:07.6 400 m freestyle 5:17.8 (OR) 5:21.2 5:22.5 100 m backstroke 1:14.4 (OR) 1:16.0 1:16.7 200 m breaststroke 2:57.2 2:57.7 3:00.2 4 × 100 metre freestyle relay Marie CorridonThelma KalamaBrenda HelserAnn Curtis 4:29.2 (OR) Eva ArndtKaren HarupGreta AndersenFritze Carstensen 4:29.6 Irma Heijting-SchuhmacherMargot MarsmanMarie-Louise Linssen-VaessenHannie Termeulen 4:31.6
Participating nations 249 swimmers from 34 nations competed.
References