The 2012 European Junior Swimming Championships were held from 4–8 July 2012 in Antwerp, Belgium. The Championships were organized by LEN, the European Swimming League, and were held in a 50-meter pool. Per LEN rules, competitors have age 15 or 16 for girls and 17 or 18 for boys.
| 50 m freestyle | Maximilian Oswald | 22.28 | Volodymyr Suschyk | 22.60 | Bogdan Plavin | 22.63 | |
| 100 m freestyle | Maximilian Oswald | 49.68 | Stepan Surkov | 50.27 | Oscar Ekstroem | 50.35 | |
| 200 m freestyle | Riccardo Maestri | 1:48.62 | Maximilian Oswald | 1:49.55 | Christian Scherübl | 1:49.67 | |
| 400 m freestyle | Gabriele Detti | 3:49.67 | Matthew Johnson | 3:51.04 | James Guy | 3:51.84 | |
| 800 m freestyle | Rob Muffels | 7:59.43 | Antonio Arroyo Perez | 8:01.65 | Marcin Kaczmarski | 8:02.13 | |
| 1500 m freestyle | Gabriele Detti | 15:11.41 | Rob Muffels | 15:18.82 | Antonio Arroyo Perez | 15:21.89 | |
| 50 m backstroke | Niccolò Bonacchi | 25.46 | Tomer Zamia | 25.76 | Viktar Staselovich Nikita Ulyanov | 25.88 | |
| 100 m backstroke | Andrei Shabasov | 55.24 | Fabio Laugeni | 55.31 | Niccolò Bonacchi | 55.63 | |
| 200 m backstroke | Joseph Patching | 1:59.45 | Luca Mencarini | 1:59.66 | Danas Rapšys  | 2:00.12 | |
| 50 m breaststroke | Oleg Utekhin | 27.57 | Ross Murdoch | 28.09 | Johannes Skagius | 28.41 | |
| 100 m breaststroke | Danila Artiomov | 1:01.60 | Johannes Skagius | 1:01.61 | Craig Benson | 1:01.64 | |
| 200 m breaststroke | Marat Amaltdinov | 2:13.15 | Ross Murdoch | 2:14.53 | Irakli Bolkvadze | 2:15.46 | |
| 50 m butterfly | Mihael Vukic | 23.96 | Benjamin Proud | 24.11 | Maximilian Oswald | 24.21 | |
| 100 m butterfly | Andreas Vazaios | 53.43 | Michal Poprawa | 53.48 | Albert Puig Garrich | 53.77 | |
| 200 m butterfly | Matthew Johnson | 1:58.50 | Andrey Tambovskiy | 1:59.25 | Tobias Zajusch | 1:59.78 | |
| 200 m individual medley | Albert Puig Garrich | 2:00.95 | Andreas Vazaios | 2:01.73 | Phillipp Forster | 2:01.94 | |
| 400 m individual medley | Matthew Johnson | 4:17.26 | Kevin Wedel | 4:21.50 | Semen Makovich | 4:21.86 | |
| 4x100 m freestyle | 3:20.82 | 3:21.18 | 3:21.96 | ||||
| 4x200 m freestyle | 7:19.56 CR | 7:23.19 | 7:23.79 | ||||
| 4x100 m medley | 3:41.36 | 3:41.49 | 3:42.84 | ||||
| 50 m freestyle | Anna-Stephanie Dietterle | 25.40 | Rozaliya Nasretdinova | 25.65 | Nastja Govejšek | 25.68 | |
| 100 m freestyle | Mariya Baklakova | 55.08 | Anna-Stephanie Dietterle | 55.42 | Amelia Maughan | 55.64 | |
| 200 m freestyle | Mariya Baklakova | 1:58.59 | Diletta Carli | 1:59.75 | Mie Nielsen | 1:59.91 | |
| 400 m freestyle | Diletta Carli | 4:09.36 CR | Ksenia Yuskova | 4:12.28 | Camille Gheorghiu | 4:12.64 | |
| 800 m freestyle | María Vilas | 8:42.41 | Nikoletta Kiss | 8:43.03 | Flora Sibalin | 8:45.00 | |
| 1500 m freestyle | Leonie Antonia Beck | 16:29.12 | Lena-Sophie Bermel | 16:32.67 | María Vilas | 16:37.25 | |
| 50 m backstroke | Mie Nielsen | 28.51 CR | Anna-Stephanie Dietterle | 28.73 | Jessica Fullalove | 28.99 | |
| 100 m backstroke | Mie Nielsen | 1:00.87 | Jessica Fullalove | 1:01.72 | Ambra Esposito | 1:02.57 | |
| 200 m backstroke | Iuliia Larina | 2:11.07 | Iryna Glavnyk | 2:12.87 | Ambra Esposito | 2:14.45 | |
| 50 m breaststroke | Margarethe Hummel | 31.55 | Sophie Taylor | 31.76 | Anna Sztankovics | 31.98 | |
| 100 m breaststroke | Anna Sztankovics | 1:08.43 | Margarethe Hummel | 1:09.33 | Julia Willers | 1:10.02 | |
| 200 m breaststroke | Molly Renshaw | 2:27.66 | Anna Sztankovics | 2:28.63 | Sophie Taylor | 2:29.55 | |
| 50 m butterfly | Louise Hansson | 26.53 | Svetlana Chimrova | 26.62 | Elena Czeschner | 27.14 | |
| 100 m butterfly | Svetlana Chimrova | 59.07 | Liliána Szilágyi | 59.91 | Christina Munkholm | 1:00.24 | |
| 200 m butterfly | Liliána Szilágyi | 2:10.53 | Elena Czeschner | 2:12.10 | Rosalie Kaethner | 2:14.45 | |
| 200 m individual medley | Dalma Sebestyén | 2:16.09 | Iryna Glavnyk | 2:17.06 | Réka György | 2:17.20 | |
| 400 m individual medley | Iuliia Larina | 4:44.70 | María Vilas | 4:45.48 | Chloe Tutton | 4:48.47 | |
| 4x100 m freestyle | 3:43.12 CR | 3:45.18 | 3:45.51 | ||||
| 4x200 m freestyle | 8:06.85 | 8:11.56 | 8:11.94 | ||||
| 4x100 m medley | 4:07.61 | 4:08.40 | 4:08.80 | ||||
43 countries will take part in 2011 European Junior Swimming Championships with total of 486 swimmers.[1]