| 2012 World Junior Championships in Athletics | |
| Host City: |  Barcelona, Catalonia, Spain |
| Nations: | 171 |
| Athletes: | 1566 |
| Events: | 44 |
| Dates: | 10–15 July |
| Opened By: | Juan Carlos I of Spain |
| Stadium: | Estadi Olímpic Lluís Companys |
| Previous: | 2010 Moncton |
The 2012 World Junior Championships in Athletics was an international athletics competition for athletes qualifying as juniors (born 1993 or later) which was held at the Estadi Olímpic Lluís Companys in Barcelona, Catalonia, Spain, on 10–15 July 2012.[1] A total of 44 athletics events were contested at the championships, 22 by male and 22 by female athletes.
Several medalists from the 2010 championships were eligible to defend their titles, including Jacko Gill, Jodie Williams, Shaunae Miller, and Angelica Bengtsson. Gill and Bengtsson were successful.
| 100 m | Adam Gemili | 10.05 WJL CR | Aaron Ernest | 10.17 PB | Odean Skeen | 10.28 PB | ||
| 200 m | Delano Williams | 20.48 NJ | Aaron Ernest | 20.53 PB | Tyreek Hill | 20.54 | ||
| 400 m | Luguelín Santos | 44.85 | Arman Hall | 45.39 PB | Steven Solomon Aldrich Bailey | 45.52 | ||
| 800 m | Nigel Amos | 1:43.79 CR | Timothy Kitum | 1:44.56 | Edwin Kiplagat Melly | 1:44.79 PB | ||
| 1500 m | Hamza Driouch | 3:39.04 | Hillary Cheruiyot Ngetich | 3:40.39 PB | Abdelhadi Labâli | 3:40.60 | ||
| 5000 m | Muktar Edris | 13:38.95 | Abrar Osman Adem | 13:40.52 | Wiliam Malel Sitonik | 13:40.52 | ||
| 10,000 m | Yigrem Demelash | 28:16.07 PB | Philemon Kipchilis Cheboi | 28:23.98 PB | Geoffrey Kipkorir Kirui | 28:30.47 | ||
| 110 m hurdles (99.0 cm) | Yordan Luis O'Farrill | 13.18 CR | Nicholas Hough | 13.27 AJ | Wilhem Belocian | 13.29 NJ | ||
| 400 m hurdles | Eric Futch | 50.24 WJL | Takahiro Matsumoto | 50.41 PB | Ibrahim Mohammed Saleh | 50.47 PB | ||
| 3000 m steeplechase | Conseslus Kipruto | 8:06.10 CR | Gilbert Kiplangat Kirui | 8:19.94 | Hicham Sigueni | 8:30.14 | ||
| 4×100 m relay | 38.67 WJL | valign=top | Tykwendo Tracey Odean Skeen Jevaughn Minzie Jazeel Murphy | 38.97 NJ | valign=top | Kazuma Oseto Akiyuki Hashimoto Aska Cambridge Kazuki Kanamori | 39.02 | |
| 4×400 m relay | 3:03.99 WJL | valign=top | Karol Zalewski Rafał Smoleń Piotr Kuśnierz Patryk Dobek | 3:05.05 NJ | valign=top | Asa Guevara Jereem Richards Brandon Benjamin Machel Cedenio | 3:06.32 | |
| 10,000 m walk | Éider Arévalo | 40:09.74 WJL | Aleksandr Ivanov | 40:12.90 PB | Su Guanyu | 40:16.87 PB |
| High jump | Andrei Churyla | 2.24 | Falk Wendrich | 2.24 PB | Ryan Ingraham | 2.24 | |
| Pole vault | Thiago Braz da Silva | 5.55 NJ | Ivan Horvat | 5.55 | Shawnacy Barber | 5.55 NJ | |
| Long jump | Sergey Morgunov | 8.09 | Andreas Trajkovski | 7.82 NJ | Jarrion Lawson | 7.64 | |
| Triple jump | Pedro Pichardo | 16.79 WJL | Artem Primak | 16.60 | Latario Collie-Minns | 16.37 | |
| Shot put (6 kg) | Jacko Gill | 22.20 CR | Krzysztof Brzozowski | 21.78 NJ | Damien Birkinhead | 21.14 NJ | |
| Discus throw (1.750 kg) | Fedrick Dacres | 62.80 PB | Wojciech Praczyk | 62.75 | Gerhard de Beer | 61.57 | |
| Hammer throw (6 kg) | Ashraf Amgad Elseify | 85.57 WJ | Bence Pásztor | 76.74 | Suhrob Khodjaev | 76.16 PB | |
| Javelin throw | Keshorn Walcott | 78.64 | Braian Toledo | 77.09 | Morné Moolman | 76.29 PB | |
| Decathlon (junior) | Gunnar Nixon | 8018 WJL | Jake Stein | 7951 AJ | Tim Dekker | 7815 PB |
| 100 m | Anthonique Strachan | 11.20 WJL | Nimet Karakuş | 11.36 | Tamiris de Liz | 11.45 | ||
| 200 m | Anthonique Strachan | 22.53 CR | Olivia Ekpone | 23.15 PB | Dezerea Bryant | 23.15 | ||
| 400 m | Ashley Spencer | 50.50 CR | Kadecia Baird | 51.04 AJ | Erika Rucker | 51.10 PB | ||
| 800 m | Ajee' Wilson | 2:00.91 PB | Jessica Judd | 2:00.96 PB | Manal El Bahraoui | 2:03.09 | ||
| 1500 m | Faith Kipyegon | 4:04.96 CR | Amela Terzić | 4:07.59 PB, NR | Senbere Teferi | 4:08.28 PB | ||
| 3000 m | Mercy Chebwogen | 9:08.88 PB | Hiwot Gebrekidan | 9:09.27 PB | Emelia Gorecka | 9:09.43 PB | ||
| 5000 m | Buze Diriba | 15:32.94 | Ruti Aga | 15:32.95 PB | Agnes Jebet Tirop | 15:36.74 PB | ||
| 100 m hurdles | Morgan Snow | 13.38 | Noemi Zbären | 13.42 | Ekaterina Bleskina | 13.43 | ||
| 400 m hurdles | Janieve Russell | 56.62 WJL | Aurélie Chaboudez | 57.14 NJ | Kaila Barber | 57.63 | ||
| 3000 m steeplechase | Daisy Jepkemei | 9:47.22 WJL | Tejinesh Gebisa | 9:50.51 PB | Stella Jepkosgei Rutto | 9:50.58 PB | ||
| 4×100 m relay | 43.89 WJL | valign=top | Alexandra Burghardt Ida Mayer Katharina Grompe Jessie Maduka | 44.24 SB | valign=top | Camila de Souza Tamiris de Liz Nathalia da Rosa Jessica Dos Reis | 44.29 SB | |
| 4×400 m relay | 3:30.01 WJL | valign=top | Sandrae Farquharson Olivia James Shericka Jackson Janieve Russell | 3:32.97 SB | valign=top | Yana Glotova Alina Galitskaya Yuliya Koltachikhina Ekaterina Renzhina | 3:36.42 | |
| 10,000 m walk | Ekaterina Medvedeva | 45:41.74 | Nadezhda Leontyeva | 45:43.64 PB | Sandra Arenas | 45:44.46 |
| High jump | Alessia Trost | 1.91 | Lissa Labiche | 1.88 NJ | Mariya Kuchina | 1.88 |
| Pole vault | Angelica Bengtsson | 4.50 CR | Elizabeth Parnov | 4.30 | Roberta Bruni | 4.20 |
| Long jump | Katarina Johnson-Thompson | 6.81w | Lena Malkus | 6.80w | Jazmin Sawyers | 6.67 WJL |
| Triple jump | Ana Peleteiro | 14.17 WJL | Dovilė Dzindzaletaitė | 14.17 WJL, NR | Liuba Zaldívar | 13.90 |
| Shot put | Shanice Craft | 17.15 WJL | Gao Yang | 16.57 | Bian Ka | 16.48 |
| Discus throw | Anna Rüh | 62.38 | Shanice Craft | 60.42 | Shelbi Vaughan | 60.07 |
| Hammer throw | Alexandra Tavernier | 70.62 CR | Alexia Sedykh | 67.34 | Alena Navahrodskaya | 67.13 PB |
| Javelin throw | Sofi Flinck | 61.40 WJL, NR | Liu Shiying | 59.20 PB | Marija Vučenović | 57.12 PB |
| Heptathlon | Yorgelis Rodríguez | 5966 | Xénia Krizsán | 5957 PB | Tamara de Sousa | 5900 AJ |
According to an unofficial count through an unofficial result list, 1566 athletes from 171 countries participated in the event. This is in agreement with the official numbers as published.