The fastest junior athletes
| # | Athlete | Nat | Date of Birth | Age | Mark | Venue | Date |
| 1 | Emmanuel Wanyonyi | KEN | 01-08-2004 | 19 | 1.41.58 | Paris | 07-07-2024 |
| 2 | Nijel Amos | BOT | 15-03-1994 | 18 | 1.41.73 | London | 09-08-2012 |
| 3 | Cooper Lutkenhaus | USA | 19-12-2008 | 16 | 1.42.27 | Eugene OR | 03-08-2025 |
| 4 | Mohammed Aman | ETH | 10-01-1994 | 19 | 1.42.37 | Bruxelles | 06-09-2013 |
| 5 | Timothy Kitum | KEN | 20-11-1994 | 17 | 1.42.53 | London | 09-08-2012 |
| 6 | Abubaker Kaki | SUD | 21-06-1989 | 18 | 1.42.69 | Oslo | 06-06-2008 |
| 7 | Japheth Kimutai | KEN | 20-12-1978 | 19 | 1.42.76 | Stuttgart | 19-07-1998 |
| 8 | Alfred Kipketer | KEN | 28-12-1996 | 19 | 1.42.87 | Paris | 27-08-2016 |
| 9 | Abraham Rotich | KEN | 26-06-1993 | 19 | 1.43.13 | Monaco | 20-07-2012 |
| 10 | Benson Koech | KEN | 10-11-1974 | 19 | 1.43.17 | Rieti | 28-08-1994 |
| 11 | Asbel Kiprop | KEN | 30-06-1989 | 19 | 1.43.17 | Doha | 08-05-2009 |
| 12 | Leonard Kosencha | KEN | 21-08-1994 | 17 | 1.43.40 | Monaco | 20-07-2012 |
| 13 | Ko Ochiai | JPN | 17-08-2006 | 19 | 1.43.45 | Tokyo | 30-05-2026 |
| 14 | Donavan Brazier | USA | 15-04-1997 | 19 | 1.43.55 | Eugene OR | 10-06-2016 |
| 15 | Robert Biwott | KEN | 28-01-1996 | 19 | 1.43.56 | Barcelona | 08-07-2015 |
| 16 | David Rudisha | KEN | 17-12-1988 | 19 | 1.43.72 | Oslo | 06-06-2008 |
| 17 | Abraham Chepkirwok | UGA | 18-11-1988 | 19 | 1.43.72 | Madrid | 05-07-2008 |
| 18 | Earl Jones | USA | 17-07-1964 | 19 | 1.43.74 | Los Angeles CA | 19-06-1984 |
| 19 | Kipyegon Bett | KEN | 02-01-1998 | 18 | 1.43.76 | Berlin | 03-09-2016 |
| 20 | Edwin Melly | KEN | 06-07-1995 | 17 | 1.43.81 | Rieti | 09-09-2012 |
| 21 | Alfred Kirwa Yego | KEN | 28-11-1986 | 19 | 1.43.89 | Rieti | 27-08-2006 |
| 22 | Anthony Chemut | KEN | 17-12-1992 | 19 | 1.43.96 | Nairobi | 23-06-2012 |
| 23 | David Mutua | KEN | 20-04-1992 | 19 | 1.43.99 | Monaco | 22-07-2011 |
| 24 | Cameron Myers | AUS | 09-06-2006 | 19 | 1.44.05 | Karlsruhe | 30-05-2026 |
| 25 | Peyton Craig | AUS | 28-03-2005 | 19 | 1.44.11 | Paris | 09-08-2024 |
| 26 | Max Burgin | GBR | 20-05-2002 | 18 | 1.44.14 | Ostrava | 19-05-2021 |
| 27 | Yuriy Borzakovskiy | RUS | 12-04-1981 | 19 | 1.44.15i | Karlsruhe | 27-01-2001 |
| 28 | Will Sumner | USA | 22-10-2003 | 19 | 1.44.26 | Austin TX | 09-06-2023 |
| 29 | Majid Saeed Sultan | QAT | 03-11-1986 | 18 | 1.44.27 | Incheon | 04-09-2005 |
| 30 | Bob Abdelrahim | AUS | 16-03-2006 | 19 | 1.44.27 | Perth | 14-02-2026 |
| 31 | Jim Ryun | USA | 29-04-1947 | 19 | 1.44.3 y | Terre Haute IN | 10-06-1966 |
| 32 | Joaquim Cruz | BRA | 12-03-1963 | 18 | 1.44.3 m | Rio de Janeiro | 27-06-1981 |
| 33 | Belal Mansoor Ali | BRN | 17-10-1985 | 19 | 1.44.34 | Conegliano | 17-06-2005 |
| 34 | Ermiyas Girma | ETH | 20-01-2005 | 17 | 1.44.36 | Lokeren | 22-05-2022 |
| 35 | Daniel Williams | AUS | 03-08-2007 | 18 | 1.44.37 | Adelaide | 14-03-2026 |
| 36 | Mohammed Al Salhi | KSA | 11-05-1986 | 19 | 1.44.39 | Lapinlahti | 03-07-2005 |
| 37 | Mohamed Ali Gouaned | ALG | 05-07-2002 | 19 | 1.44.43 | Paris | 18-06-2022 |
| 38 | Nicholas Wachira | KEN | 19-11-1982 | 19 | 1.44.44 | Torino | 07-06-2002 |
| 39 | Mark Everett | USA | 02-09-1968 | 19 | 1.44.46 | Indianapolis IN | 19-07-1988 |
| 40 | Jakub Dudycha | CZE | 05-09-2005 | 19 | 1.44.48 | Ostrava | 24-06-2025 |
| 41 | Wilfred Bungei | KEN | 24-07-1980 | 19 | 1.44.5 m | Milano | 07-06-2000 |
| 42 | Willy Tarbei | KEN | 30-05-1998 | 17 | 1.44.51 | Nairobi | 17-06-2015 |
| 43 | Krzysztof Róznicki | POL | 29-08-2003 | 17 | 1.44.51 | Chorzów | 20-06-2021 |
| 44 | Julius Achon | UGA | 12-12-1976 | 19 | 1.44.55 | Fairfax VA | 04-05-1996 |
| 45 | Benjamin Kipkurui | KEN | 28-12-1980 | 18 | 1.44.56 | Rehlingen | 24-05-1999 |
| 46 | Alex Kipngetich | KEN | 17-08-2000 | 19 | 1.44.57 | Nairobi | 13-09-2019 |
| 47 | Joseph Deng | AUS | 07-07-1998 | 19 | 1.44.61 | Stockholm | 10-06-2018 |
| 48 | Boaz Kiprugut | KEN | 01-07-1998 | 17 | 1.44.64 | Nairobi | 28-05-2016 |
| 49 | Boaz Lalang | KEN | 08-02-1989 | 19 | 1.44.68 | Athene | 13-07-2008 |
| 50 | William Chirchir | KEN | 06-02-1979 | 19 | 1.44.69 | Monaco | 08-08-1998 |
| 51 | Abderrahman El Assal | MAR | 10-06-2005 | 19 | 1.44.70 | Rabat | 25-05-2025 |
| 52 | Gary Cook | GBR | 10-02-1963 | 19 | 1.44.71 | Oslo | 07-07-1982 |
| 53 | Henry Jonas | GBR | 08-06-2005 | 19 | 1.44.72 | Belfast | 10-05-2025 |
| 54 | Niels Laros | NED | 17-04-2005 | 18 | 1.44.78 | Monaco | 21-07-2023 |
| 55 | Hillary Biwott | KEN | 02-12-2002 | 18 | 1.44.80 | Nairobi | 29-05-2021 |
| 56 | Kacper Lewalski | POL | 07-05-2003 | 18 | 1.44.84 | Chorzów | 05-09-2021 |
| 57 | Jackson Kivuva | KEN | 11-08-1989 | 19 | 1.44.86 | Madrid | 04-07-2009 |
| 58 | Noah Kibet | KEN | 12-04-2004 | 17 | 1.44.88 | Nairobi | 22-08-2021 |
| 59 | Vincent Kemboi | KEN | 29-05-1982 | 19 | 1.44.92 | Nairobi | 18-05-2002 |
| 60 | Brandon Miller | USA | 30-01-2002 | 19 | 1.44.97 | Eugene OR | 11-06-2021 |
| 61 | Cornelius Chirchir | KEN | 05-06-1983 | 18 | 1.44.98 | Rovereto | 29-08-2001 |
| 62 | Mohammed Hamada | EGY | 22-10-1992 | 19 | 1.44.98 | Torino | 08-06-2012 |