World Junior Records in Swimming: Long Course Meters
World Junior Records in Swimming: Long Course Meters
Women’s World Junior Records
| EVENT | SWIMMER | NATION | TIME | DATE | LOCATION |
| 50 Free | Claire Curzan | USA | 24.17 | 2021-05-14 | Cary, USA |
| 100 Free | Penny Oleksiak | CAN | 52.70 | 2016-08-11 | Rio de Janeiro, Brazil |
| 200 Free | Summer McIntosh | CAN | 1:53.65 | 2023-07-26 | Fukuoka, JPN |
| 400 Free | Summer McIntosh | CAN | 3:56.06 | 2023-03-28 | Toronto, CAN |
| 800 Free | Katie Ledecky | USA | 8:11.00 | 2014-06-22 | Shenandoah, USA |
| 1500 Free | Katie Ledecky | USA | 15:28.36 | 2014-08-24 | Gold Coast, AUS |
| 50 Back | Minna Atherton | AUS | 27.49 | 2016-02-07 | Brisbane, AUS |
| 100 Back | Regan Smith | USA | 57.57 | 2019-07-29 | Gwangju, KOR |
| 200 Back | Regan Smith | USA | 2:03.35 | 2019-07-26 | Gwangju, KOR |
| 50 Breast | Benedetta Pilato | ITA | 29.30 | 2021-05-22 | Budapest, HUN |
| 100 Breast | Ruta Meilutyte | LTU | 1:04.35 | 2013-07-29 | Barcelona, ESP |
| 200 Breast | Viktoria Gunes | TUR | 2:19.64 | 2015-08-30 | Singapore |
| 50 Fly | Rikako Ikee | JPN | 25.51 | 2017-04-13 | Nagoya, JPN |
| 100 Fly | Claire Curzan | USA | 56.20 | 2021-04-10 | Raleigh, USA |
| 200 Fly | Summer McIntosh | CAN | 2:04.06 | 2023-07-23 | Fukuoka, JPN |
| 200 IM | Summer McIntosh | CHN | 2:06.89 | 2023-03-30 | Toronto, CAN |
| 400 IM | Summer McIntosh | CAN | 4:25.87 | 2023-04-01 | Toronto, CAN |
| 400 Free Relay | Ruck, Oleksiak, Smith, Sanchez | CAN | 3:36.19 | 2017-08-27 | Indianapolis, USA |
| 800 Free Relay | Sanchez, Oleksiak, Smith, Ruck | CAN | 7:51.47 | 2017-08-23 | Indianapolis, USA |
| 400 Medley Relay | Hannah, Knelson, Oleksiak, Ruck | CAN | 3:58.38 | 2017-08-28 | Indianapolis, USA |
| Mixed 400 Medley Relay | Grant, Matheny, Huske, Walsh | USA | 3:44.84 | 2019-08-21 | Budapest, HUN |
| Mixed 400 Free Relay | Southam, Sommerville, Wunsch, Jansen | AUS | 3:24.29 | 2023-09-06 | Netanya, ISR |
Men’s World Junior Records
| EVENT | SWIMMER | NATION | TIME | DATE | LOCATION |
| 50 Free | Michael Andrew | USA | 21.75p | 2017-08-25 | Indianapolis, USA |
| Michael Andrew | USA | 21.75 | 2017-08-26 | Indianapolis, USA |
| 100 Free | David Popovici | ROU | 46.86 | 2022-08-13 | Rome, ITA |
| 200 Free | David Popovici | ROU | 1:42.97 | 2022-08-15 | Rome, ITA |
| 400 Free | Petar Mitsin | BUL | 3:44.31 | 2023-07-09 | Belgrade, SRB |
| 800 Free | Lorenzo Galossi | ITA | 7:43.37 | 2023-08-13 | Rome, ITA |
| 1500 Free | Franko Grgic | CRO | 14:46.09 | 2019-08-25 | Budapest, HUN |
| 50 Back | Kliment Kolesnikov | RUS | 24.00 | 2018-08-04 | Glasgow, GBR |
| 100 Back | Kliment Kolesnikov | RUS | 52.53 | 2018-08-06 | Glasgow, GBR |
| 200 Back | Kliment Kolesnikov | RUS | 1:55.14 | 2017-07-28 | Budapest, HUN |
| 50 Breast | Nicolo Martinenghi | ITA | 26.97 | 2017-04-04 | Riccione, ITA |
| 100 Breast | Nicolo Martinenghi | ITA | 59.01sf | 2017-08-23 | Indianapolis, USA |
| 200 Breast | Dong Zhihao | CHN | 2:08.04 | 2023-07-28 | Fukuoka, JPN |
| 50 Fly | Diogo Ribeiro | POR | 22.96 | 2023-09-03 | Lima, PER |
| 100 Fly | Kristof Milak | HUN | 50.62 | 2017-07-29 | Budapest, HUN |
| 200 Fly | Kristof Milak | HUN | 1:53.79 | 2017-06-30 | Netanya, ISR |
| 200 IM | Hubert Kos | HUN | 1:56.99 | 2021-05-19 | Budapest, HUN |
| 400 IM | Ilya Borodin | RUS | 4:10.02 | 2021-05-23 | Budapest, HUN |
| 400 Free Relay | Diehl, Williamson, Williams, Zhao | USA | 3:15.49 | 2023-09-04 | Netanya, ISR |
| 800 Free Relay | Magahey, Urlando, Mitchell, Foster | USA | 7:08.37 | 2019-08-23 | Budapest, HUN |
| 400 Medley Relay | Zuev, Gerasimenko, Minakov, Shchegolev | RUS | 3:33.19 | 2019-08-25 | Budapest, HUN |
| Mixed 400 Medley Relay | Grant, Matheny, Huske, Walsh | USA | 3:44.84 | 2019-08-21 | Budapest, HUN |
| Mixed 400 Free Relay | Urlando, Chaney, Tang, Walsh | USA | 3:25.92 | 2019-08-22 | Budapest, HUN |
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