The 2003 Biathlon Junior World Championships was held in Kościelisko, Poland from February 5 to February 9 2003. There was to be a total of 16 competitions: sprint, pursuit, individual, mass start, and relay races for men and women.
| Event: | Gold: | Time | Silver: | Time | Bronze: | Time | |
| 10 km individual details | Tereza Hlavsová | 45:08.7 (0+0+0+1) | Anastasiya Shipulina | 46:02.7 (2+0+2+0) | Jeanine Jung | 46:47.2 (0+1+0+2) | |
| 6 km sprint details | Maria Kossinova | 28:14.5 (2+0) | Anna Boulygina | 28:19.6 (1+1) | Jeanine Jung | 28:24.2 (1+1) | |
| 7.5 km pursuit details | Maria Kossinova | 37:25.8 (1+0+1+1) | Anastasiya Shipulina | 38:07.9 (1+0+0+2) | Anna Boulygina | 38:43.5 (1+0+3+2) | |
| 3 × 6 km relay details | Anna Boulygina Anastasiya Shipulina Maria Kossinova | 1:17:17.8 (0+3) (0+1) (0+3) (0+0) (1+3) (1+3) | Anne Preußler Friederike Göbel Jeanine Jung | 1:18:38.8 (0+1) (0+1) (0+2) (0+3) (1+3) (0+0) | Lada Dušková Petra Moravcová Tereza Hlavsová | 1:19:49.0 (0+0) (1+3) (0+3) (0+1) (0+2) (0+1) |
| Event: | Gold: | Time | Silver: | Time | Bronze: | Time | |
| 12.5 km individual details | Ute Niziak | 47:25.9 (0+0+0+0) | Nadezhda Chastina | 49:38.5 (1+0+1+0) | Liudmila Ananko | 49:39.0 (0+2+0+0) | |
| 7.5 km sprint details | Liudmila Ananko | 28:44.7 (0+0) | Yana Romanova | 28:59.2 (0+0) | Ute Niziak | 29:08.6 (1+0) | |
| 10 km pursuit details | Ute Niziak | 50:00.8 (0+2+1+1) | Yana Romanova | 50:56.6 (1+1+2+0) | Magda Rezlerová | 51:04.2 (0+0+2+1) | |
| 3 × 6 km relay details | Yana Romanova Uliana Denisova Nadezhda Chastina | 1:15:40.1 (0+1) (0+0) (1+3) (0+1) (0+2) (0+0) | Jenny Adler Katharina Echter Ute Niziak | 1:15:54.0 (0+3) (0+0) (0+0) (0+2) (1+3) (0+0) | Klara Moravcová Lenka Votočková Magda Rezlerová | 1:04:15.1 (0+0) (0+3) (0+1) (0+2) (0+0) (0+3) |
| Event: | Gold: | Time | Silver: | Time | Bronze: | Time | |
| 12.5 km individual details | Simon Fourcade | 44:19.5 (0+0+0+1) | Robert Wick | 44:35.1 (0+1+0+1) | Emil Hegle Svendsen | 45:30.4 (1+0+1+1) | |
| 7.5 km sprint details | Andrei Doubassov | 25:31.4 (1+1) | Kiril Vasilev | 25:53.0 (0+0) | Christoph Knie | 26:00.4 (2+0) | |
| 10 km pursuit details | Christoph Knie | 46:14.8 (0+0+1+2) | Oleg Berezhnoy | 46:53.2 (3+1+0+0) | Emil Hegle Svendsen | 47:34.7 (1+0+1+3) | |
| 3 × 7.5 km relay details | Vladislav Moiseev Ivan Patchenko Andrei Doubassov | 1:14:02.9 (0+0 (1+3) (0+1) (2+3) (0+0) (0+1) | Robert Wick Jens Zimmer Christoph Knie | 1:14:03.3 (0+1) (1+3) (0+1) (0+1) (0+1) (0+2) | Andriy Atroshenko Oleg Berezhnoy Igor Yashchenko | 1:15:59.9 (0+2) (0+0) (0+0) (0+2) (0+0) (0+3) |
| Event: | Gold: | Time | Silver: | Time | Bronze: | Time | |
| 15 km individual details | Jouni Kinnunen | 46:55.7 (0+0+0+1) | Miroslav Matiaško | 47:30.7 (0+0+0+1) | Ondřej Moravec | 47:52.3 (1+1+0+1) | |
| 10 km sprint details | Michael Rösch | 28:30.8 (0+0) | Michal Šlesingr | 28:34.4 (0+0) | Maxim Tchoudov | 28:41.9 (0+0) | |
| 12.5 km pursuit details | Maxim Tchoudov | 49:52.3 (0+0+1+2) | Michal Šlesingr | 50:48.7 (0+2+0+1) | Ondřej Moravec | 50:52.1 (2+0+1+0) | |
| 4 × 7.5 km relay details | Nikolai Kozlov Sergey Sadovnikov Oleg Milovanov Maxim Tchoudov | 1:35:24.5 (0+0) (0+2) (0+0) (0+0) (0+0) (0+3) (0+0) (0+3) | Hansjörg Reuter Norbert Schiller Steve Renner Michael Rösch | 1:37:29.6 (0+0) (0+2) (0+3) (2+3) (0+0) (0+3) (0+0) (0+1) | Martin Balatka Ondřej Moravec Jaroslav Soukup Michal Šlesingr | 1:37:43.3 (1+3) (0+1) (0+0) (0+1) (0+2) (0+2) (0+1) (0+0) |