World Junior Records are those officially ratified by World Athletics. Junior Records are restricted to athletes who do not turn 20 at any time during the calendar year in which the mark is made.
Symbols: + = event not officially recognized by WA; (A) = altitude-aided mark—over 1000m of altitude (in affected events only); i = made indoors; p = mark still pending ratification
| 100 | 9.91 | Letsile Tebogo (Botswana) | Cali, Colombia | 8/02/22 |
| 9.89p | Issam Asinga (Suriname) | São Paulo, Brazil | 7/28/23 | |
| 200 | 19.49 | Erriyon Knighton (US) | Baton Rouge, Louisiana | 4/30/22 |
| 300+ | 31.61 | Clarence Munyai (South Africa) | Ostrava, Czechia | 6/28/17 |
| 400 | 43.87 | Steve Lewis (US) | Seoul, South Korea | 9/28/88 |
| 800 | 1:41.73 | Nijel Amos (Botswana) | London, England | 8/09/12 |
| 1000 | 2:15.00 | Benjamin Kipkurui (Kenya) | Nice, France | 7/17/99 |
| 1500 | 3:28.81 | Ronald Kwemoi (Kenya) | Fontvieille, Monaco | 7/18/14 |
| Mile | 3:48.06 | Raynold Kipkorir (Kenya) | Eugene, Oregon | 9/16/23 |
| 2000+ | 4:48.14 | Raynold Kipkorir (Kenya) | Brussels, Belgium | 9/08/23 |
| 2000St+ | 5:19.99 | Meresa Kassaye (Ethiopia) | Donets’k, Ukraine | 7/12/13 |
| Steeple | 7:58.66 | Stephen Cherono (Kenya) | Brussels, Belgium | 8/24/01 |
| 3000 | 7:28.19 | Yomif Kejelcha (Ethiopia) | St.-Denis, France | 8/27/16 |
| 2 Miles+ | 8:08.69 | Selemon Barega (Ethiopia) | Stanford, California | 6/30/19 |
| 5000 | 12:43.02 | Selemon Barega (Ethiopia) | Brussels, Belgium | 8/31/18 |
| 10,000 | 26:41.75 | Sammy Wanjiru (Kenya) | Brussels, Belgium | 6/28/05 |
| 110 Hurdles | 12.72(A) | Sasha Zhoya (France) | Kasarani, Kenya | 8/21/21 |
| (low-altitude)+ | 12.99 | Wilhem Belocian (France) | Eugene, Oregon | 7/24/14 |
| 12.99 | Damion Thomas (Jamaica) | Kingston, Jamaica | 6/23/18 | |
| Senior 110 Hurdles+ | 13.12 | Xiang Liu (China) | Lausanne, Switzerland | 7/02/02 |
| 400 Hurdles | 47.85 | Sean Burrell (US) | Eugene, Oregon | 6/11/21 |
| 47.85p | Roshawn Clarke (Jamaica) | Kingston, Jamaica | 7/07/23 | |
| 47.34p | Roshawn Clarke (Jamaica) | Budapest, Hungary | 8/21/23 |
| Relay Events | ||||
| 4 x 100 | 38.51(A) | South Africa | Kasarani, Kenya | 8/22/21 |
| (Mihlali Xotyeni, Sinesipho Dambile, Lucky Moleyane, Benji Richardson) | ||||
| (low-altitude)+ | 38.66 | United States Juniors | Grosseto, Italy | 7/18/04 |
| (Trell Kimmons, Demi Omole, Ivory Williams, LaShawn Merritt) | ||||
| 4 x 400 | 2:59.30(A) | United States Juniors | San José, Costa Rica | 7/21/19 |
| (Frederick Lewis 45.9, Matthew Boling 44.5, Matthew Moorer 45.2, Justin Robinson 43.7) | ||||
| (low-altitude)+ | 3:00.33 | United States Juniors | Trujillo, Peru | 7/23/17 |
| (Brian Herron 45.1, Zach Shinnick 45.1, Sean Hooper 44.73, Josephus Lyles 45.36) | ||||
| Mixed-Sex 4 x 400 | 3:17.69 | United States Juniors | Cali, Colombia | 8/02/22 |
| (Charlie Bartholomew 45.09, Madison Whyte 53.39, Will Sumner 45.97, Kennedy Wade 53.24) | ||||
| Field Events | ||||
| High Jump | 2.37 | 7-9¼ | Dragutin Topić (Yugoslavia) | Plovdiv, Bulgaria | 8/12/90 |
| 2.37 | 7-9¼ | Steve Smith (Great Britain) | Seoul, South Korea | 9/20/92 | |
| Pole Vault | 6.05 | 19-10¼ | Mondo Duplantis (Sweden) | Berlin, Germany | 8/12/18 |
| Long Jump | 8.35 | 27-4¾ | Sergey Morgunov (Russia) | Cheboksary, Russia | 6/20/12 |
| Triple Jump | 17.50 | 57-5 | Volker Mai (East Germany) | Erfurt, Germany | 6/23/85 |
| 17.54 | 57-6½(A)ip | Jaydon Hibbert (Jamaica) | Albuquerque, New Mexico | 3/11/23 | |
| 17.87 | 58-7½p | Jaydon Hibbert (Jamaica) | Baton Rouge, Louisiana | 5/13/23 | |
| Shot | 23.00 | 75-5½ | Jacko Gill (New Zealand) | Auckland, New Zealand | 8/18/13 |
| Senior Shot+ | 21.14 | 69-1¼ | Konrad Bukowiecki (Poland) | Oslo, Norway | 6/09/16 |
| Discus | 71.37 | 234-2 | Mika Sosna (Germany) | Schönebeck, Germany | 6/10/22 |
| Senior Discus+ | 65.31 | 214-3 | Mykyta Nesterenko (Ukraine) | Tallinn, Estonia | 6/03/08 |
| Hammer | 85.57 | 280-9 | Ashraf Amjad Al-Saifi (Qatar) | Barcelona, Spain | 7/14/12 |
| Senior Hammer+ | 78.33 | 257-0 | Olli-Pekka Karjalainen (Finland) | Seinajöki, Finland | 8/05/99 |
| Javelin | 86.48 | 283-9 | Neeraj Chopra (India) | Bydgoszcz, Poland | 7/23/16 |
| Multi Event | ||||
| Decathlon | 8435 | Niklas Kaul (Germany) | Grosseto, Italy | 7/22-23/17 |
| (11.48, 7.20/23-7½, 15.37/50-5¼, 2.05/6-8¾, 48.42 [4170], 14.55, 48.49/159-1, 4.70/15-5, 68.05/223-3, 4:15.52 [4265]) | ||||
| Senior Decathlon+ | 8397 | Torsten Voss (East Germany) | Erfurt, East Germany | 7/06-07/82 |
| (10.76, 7.66/25-1¾, 14.41/47-3½, 2.09/6-10¼, 48.37 [4421], 14.37, 41.76/137-0, 4.80/15-9, 62.90/206-4, 4:34.04 [3976]) | ||||
| Road Events | ||||
| 10K+ | 26:46 | Rhonex Kipruto (Kenya) | Prague, Czechia | 9/08/18 |
| Marathon+ | 2:04:32 | Tsegaye Mekonnen (Ethiopia) | Dubai, United Arab Emirates | 1/24/14 |
| Walk Events | ||||
| 10,000 | 38:46.4 | Viktor Burayev (Russia) | Moscow, Russia | 5/20/00 |
| 10K(r) | 37:44 | Zhen Wang (China) | Beijing, China | 9/18/10 |
| 20W | 1:17:25 | Sergey Shirobokov (Russia) | Cheboksary, Russia | 6/09/18 |
as of November 25, 2023