| 2nd European Aquatics Championships | |
| Host City: | Bologna |
| Country: | Italy |
| Events: | 16 |
| Previous: | Budapest 1926 |
The 1927 LEN European Aquatics Championships were held from 31 August to 4 September in Bologna, Italy. Women's events were held for the first time.
| 3 m springboard | Ewald Riebschläger | 7/173.86 | Edmund Lindmark | 16.5/159.86 | Luciano Cozzi | 18/160.14 | |
| Platform | Hans Luber | 7/114.86 | Ewald Riebschläger | 11/111.24 | Ezio Selva | 18/100.64 |
| 3 m springboard | Klara Bornett | 5/103.32 | Lini Söhnchen | 11/91.96 | Hanni Rehborn | 14/86.24 | |
| Platform | Isabelle White | 5/36.40 | Irène Savollon | 12.5/32.40 | Eva Olliwier | 14/32.20 |
| 100 m freestyle | Arne Borg | 1:00.0 | István Bárány | 1:03.2 | August Heitmann | 1:03.4 | |
| 400 m freestyle | Arne Borg | 5:08.6 | Herbert Heinrich | 5:15.8 | Václav Antoš | 5:16.2 | |
| 1500 m freestyle | Arne Borg | 19:07.2 WR | Giuseppe Perentin | 21:50.4 | Joachim Rademacher | 22:00.0 | |
| 100 m backstroke | Eskil Lundahl | 1:17.4 | Aladár Bitskey | 1:17.6 | Gustav Fröhlich | 1:17.8 | |
| 200 m breaststroke | Erich Rademacher | 2:55.2 | Wilhelm Prasse | 2:58.0 | Louis Van Parijs | 2:59.8 | |
| 4×200 m freestyle relay | August Heitmann Joachim Rademacher Friedrich Berger Herbert Heinrich | 9:49.6 WR | Åke Borg Aulo Gustafsson Eskil Lundahl Arne Borg | 9:52.0 | Géza Szigritz Rezsö Wanie András Wanié István Bárány | 10:36.0 |
| 100 m freestyle | Maria Vierdag | 1:15.0 | Joyce Cooper | 1:15.0 | Charlotte Lehmann | 1:16.1 | |
| 400 m freestyle | Marie Braun | 6:11.8 | Marion Laverty | 6:13.6 | Fritzi Löwy | 6:21.0 | |
| 100 m backstroke | Willy den Turk | 1:24.6 | Marie Braun | 1:26.2 | Phyllis Harding | 1:30.8 | |
| 200 m breaststroke | Hilde Schrader | 3:20.4 | Charlotte Mühe | 3:25.2 | Hedy Bienenfeld | 3:27.0 | |
| 4×100 m freestyle relay | Marion Laverty Valerie Davies Ellen King Joyce Cooper | 5:11.0 | Truus Klapwijk Willy den Turk Marie Braun Maria Vierdag | 5:11.6 | Charlotte Lehmann Anni Rehborn Marianne Schmidt Reni Erkens | 5:12.8 |
| Men's tournament |