# World Aquatics Junior Swimming Championships

The World Aquatics Junior Swimming Championships (commonly referred to as 'Junior World Championships' or 'Junior Worlds') is an international swimming championship event organized biennially by World Aquatics for swimmers aged 14–18 years as of 31 December of the year of the competition. It is usually held on odd years. Prior to 2023, the event was known as the FINA World Junior Swimming Championships and was open to female swimmers aged 14–17 and male swimmers aged 15–18 as of 31 December of the year of the competition.

## Editions

| Number | Year | Location | Dates | Number of swimmers | Number of countries | Events | Top nation |
| 1 | 2006 | Rio de Janeiro, Brazil | 22–27 August | 685 | 81 | 40 | Italy |
| 2 | 2008 | Monterrey, Mexico | 8–12 July | 480 | 61 | 40 | United States |
| 3 | 2011 | Lima, Peru | 16–21 August | 528 | 58 | 40 | United States |
| 4 | 2013 | Dubai, United Arab Emirates | 26–31 August | 900 | 95 | 42 | Australia |
| 5 | 2015 | Kallang, Singapore | 25–30 August | 700 | 87 | 42 | Australia |
| 6 | 2017 | Indianapolis, USA | 23–28 August | 619 | 90 | 42 | United States |
| 7 | 2019 | Budapest, Hungary | 20–25 August | 814 | 126 | 42 | United States |
| 8 | 2022 | Lima, Peru | 30 August – 4 September | 509 | 87 | 42 | Japan |
| 9 | 2023 | Netanya, Israel | 4–9 September | 648 | 93 | 42 | United States |
| 10 | 2025 | Otopeni, Romania | 19–24 August | | | | |

## Medal table

Last updated after the 2023 Championships
| Rank | Nation | Gold | Silver | Bronze | Total |
| 1 | United States | 85 | 69 | 59 | 213 |
| 2 | Australia | 40 | 30 | 26 | 96 |
| 3 | Russia | 35 | 40 | 42 | 117 |
| 4 | Japan | 29 | 34 | 32 | 95 |
| 5 | Italy | 24 | 35 | 42 | 101 |
| 6 | Canada | 18 | 26 | 32 | 76 |
| 7 | Hungary | 13 | 20 | 3 | 36 |
| 8 | Spain | 12 | 7 | 12 | 31 |
| 9 | Poland | 12 | 6 | 13 | 31 |
| 10 | Great Britain | 10 | 12 | 19 | 41 |
| 11 | Ukraine | 10 | 4 | 5 | 19 |
| 12 | Turkey | 10 | 2 | 2 | 14 |
| 13 | New Zealand | 9 | 2 | 1 | 12 |
| 14 | China | 6 | 11 | 9 | 26 |
| 15 | Romania | 6 | 4 | 3 | 13 |
| 16 | Germany | 5 | 9 | 5 | 19 |
| 17 | France | 5 | 6 | 10 | 21 |
| 18 | Lithuania | 5 | 3 | 3 | 11 |
| 19 | Brazil | 3 | 10 | 6 | 19 |
| 20 | Greece | 3 | 3 | 5 | 11 |
| 21 | Croatia | 3 | 2 | 2 | 7 |
| 22 | Portugal | 3 | 0 | 0 | 3 |
| 23 | South Africa | 2 | 6 | 9 | 17 |
| 24 | Czech Republic | 2 | 5 | 4 | 11 |
| 25 | Serbia | 2 | 5 | 3 | 10 |
| 26 | Austria | 2 | 3 | 4 | 9 |
| 27 | Argentina | 2 | 1 | 2 | 5 |
| 27 | Denmark | 2 | 1 | 2 | 5 |
| 29 | Belgium | 2 | 1 | 0 | 3 |
| 29 | Bosnia and Herzegovina | 2 | 1 | 0 | 3 |
| 31 | Hong Kong | 2 | 0 | 2 | 4 |
| 32 | Slovenia | 2 | 0 | 0 | 2 |
| 33 | Belarus | 1 | 3 | 1 | 5 |
| 34 | Bulgaria | 1 | 2 | 2 | 5 |
| 35 | Estonia | 1 | 1 | 1 | 3 |
| 35 | Ireland | 1 | 1 | 1 | 3 |
| 37 | Trinidad and Tobago | 1 | 1 | 0 | 2 |
| 38 | Egypt | 1 | 0 | 1 | 2 |
| 39 | Indonesia | 1 | 0 | 0 | 1 |
| 40 | Sweden | 0 | 4 | 2 | 6 |
| 41 | Malaysia | 0 | 2 | 0 | 2 |
| 42 | Cyprus | 0 | 1 | 1 | 2 |
| 42 | South Korea | 0 | 1 | 1 | 2 |
| 44 | Venezuela | 0 | 0 | 3 | 3 |
| 45 | Ecuador | 0 | 0 | 1 | 1 |
| 45 | Panama | 0 | 0 | 1 | 1 |
| 45 | Slovakia | 0 | 0 | 1 | 1 |
| Totals (47 entries) | Totals (47 entries) | 373 | 374 | 373 | 1,120 |

## Championships records

All records were set in finals unless noted otherwise. All times are swum in a long-course (50m) pool.

### Men

| Event | Time | | Name | Nationality | Date | Meet | Location |
| 50m freestyle | 21.75 | h, = | Michael Andrew | United States | 25 August 2017 | 2017 Championships | Indianapolis, United States |
| 50m freestyle | 21.75 | = | Michael Andrew | United States | 26 August 2017 | 2017 Championships | Indianapolis, United States |
| 100m freestyle | 47.07 | r | David Popovici | Romania | 30 August 2022 | 2022 Championships | Lima, Peru |
| 200m freestyle | 1:46.18 | | David Popovici | Romania | 31 August 2022 | 2022 Championships | Lima, Peru |
| 400m freestyle | 3:46.06 | | Gábor Zombori | Hungary | 20 August 2019 | 2019 Championships | Budapest, Hungary |
| 800m freestyle | 7:45.67 | | Mack Horton | Australia | 28 August 2013 | 2013 Championships | Dubai, United Arab Emirates |
| 1500m freestyle | 14:46.09 | | Franko Grgić | Croatia | 25 August 2019 | 2019 Championships | Budapest, Hungary |
| 50m backstroke | 24.44 | | Ksawery Masiuk | Poland | 2 September 2022 | 2022 Championships | Lima, Peru |
| 100m backstroke | 52.91 | | Ksawery Masiuk | Poland | 31 August 2022 | 2022 Championships | Lima, Peru |
| 200m backstroke | 1:56.05 | | Pieter Coetze | South Africa | 4 September 2022 | 2022 Championships | Lima, Peru |
| 50m breaststroke | 26.98 | h | Felix Viktor Iberle | Indonesia | 8 September 2023 | 2023 Championships | Netanya, Israel |
| 100m breaststroke | 59.01 | sf | Nicolò Martinenghi | Italy | 23 August 2017 | 2017 Championships | Indianapolis, United States |
| 200m breaststroke | 2:09.40 | | Josh Matheny | United States | 23 August 2019 | 2019 Championships | Budapest, Hungary |
| 50m butterfly | 22.96 | | Diogo Ribeiro | Portugal | 3 September 2022 | 2022 Championships | Lima, Peru |
| 100m butterfly | 51.08 | | Kristóf Milák | Hungary | 25 August 2017 | 2017 Championships | Indianapolis, United States |
| 200m butterfly | 1:53.87 | | Kristóf Milák | Hungary | 28 August 2017 | 2017 Championships | Indianapolis, United States |
| 200m individual medley | 1:57.29 | | Maximus Williamson | United States | 5 September 2023 | 2023 Championships | Netanya, Israel |
| 400m individual medley | 4:10.97 | | Tomoyuki Matsushita | Japan | 8 September 2023 | 2023 Championships | Netanya, Israel |
| 4×100m freestyle relay | 3:15.49 | | Daniel Diehl (49.93)Maximus Williamson (47.78)Hudson Williams (49.14)Jason Zhao (48.64) | United States | 4 September 2023 | 2023 Championships | Netanya, Israel |
| 4×200m freestyle relay | 7:08.37 | | Jake Magahey (1:48.11)Luca Urlando (1:47.13)Jake Mitchell (1:47.03)Carson Foster (1:46.10) | United States | 23 August 2019 | 2019 Championships | Budapest, Hungary |
| 4×100m medley relay | 3:33.19 | | Nikolay Zuev (53.84)Vladislav Gerasimenko (59.53)Andrei Minakov (50.93)Aleksandr Shchegolev (48.89) | Russia | 25 August 2019 | 2019 Championships | Budapest, Hungary |

### Women

| Event | Time | | Name | Nationality | Date | Meet | Location |
| 50m freestyle | 24.59 | = | Rikako Ikee | Japan | 28 August 2017 | 2017 Championships | Indianapolis, United States |
| 50m freestyle | 24.59 | = | Olivia Wunsch | Australia | 9 September 2023 | 2023 Championships | Netanya, Israel |
| 100m freestyle | 53.63 | r | Taylor Ruck | Canada | 27 August 2017 | 2017 Championships | Indianapolis, United States |
| 200m freestyle | 1:57.08 | | Taylor Ruck | Canada | 28 August 2017 | 2017 Championships | Indianapolis, United States |
| 400m freestyle | 4:05.42 | | Lani Pallister | Australia | 23 August 2019 | 2019 Championships | Budapest, Hungary |
| 800m freestyle | 8:22.49 | | Lani Pallister | Australia | 21 August 2019 | 2019 Championships | Budapest, Hungary |
| 1500m freestyle | 15:58.86 | | Lani Pallister | Australia | 24 August 2019 | 2019 Championships | Budapest, Hungary |
| 50m backstroke | 27.81 | | Gabrielle Fa'amausili | New Zealand | 29 August 2015 | 2015 Championships | Singapore, Singapore |
| 100m backstroke | 59.11 | | Regan Smith | United States | 24 August 2017 | 2017 Championships | Indianapolis, United States |
| 200m backstroke | 2:07.45 | | Regan Smith | United States | 25 August 2017 | 2017 Championships | Indianapolis, United States |
| 50m breaststroke | 29.86 | | Rūta Meilutytė | Lithuania | 27 August 2013 | 2013 Championships | Dubai, United Arab Emirates |
| 100m breaststroke | 1:06.23 | sf | Eneli Jefimova | Estonia | 6 September 2023 | 2023 Championships | Netanya, Israel |
| 200m breaststroke | 2:19.64 | | Viktoriya Zeynep Gunes | Turkey | 30 August 2015 | 2015 Championships | Singapore, Singapore |
| 50m butterfly | 25.46 | | Rikako Ikee | Japan | 26 August 2017 | 2017 Championships | Indianapolis, United States |
| 100m butterfly | 57.25 | | Rikako Ikee | Japan | 28 August 2017 | 2017 Championships | Indianapolis, United States |
| 200m butterfly | 2:07.20 | | Lana Pudar | Bosnia and Herzegovina | 5 September 2023 | 2023 Championships | Netanya, Israel |
| 200m individual medley | 2:10.24 | | Leah Hayes | United States | 7 September 2023 | 2023 Championships | Netanya, Israel |
| 400m individual medley | 4:36.84 | | Leah Hayes | United States | 4 September 2023 | 2023 Championships | Netanya, Israel |
| 4×100m freestyle relay | 3:36.19 | | Taylor Ruck (53.63)Penny Oleksiak (53.70)Rebecca Smith (54.65)Kayla Sanchez (54.21) | Canada | 27 August 2017 | 2017 Championships | Indianapolis, United States |
| 4×200m freestyle relay | 7:51.47 | | Kayla Sanchez (1:59.01)Penny Oleksiak (1:56.86)Rebecca Smith (1:58.66)Taylor Ruck (1:56.94) | Canada | 23 August 2017 | 2017 Championships | Indianapolis, United States |
| 4×100m medley relay | 3:58.38 | | Jade Hannah (1:00.68)Faith Knelson (1:07.86)Penny Oleksiak (56.91)Taylor Ruck (52.93) | Canada | 28 August 2017 | 2017 Championships | Indianapolis, United States |

### Mixed

| Event | Time | Name | Nationality | Date | Meet | Location | Ref |
| 4x100m freestyle relay | 3:24.29 | Flynn Southam (48.58)Edward Sommerville (48.54)Olivia Wunsch (53.62)Milla Jensen (53.55) | Australia | 6 September 2023 | 2023 Championships | Netanya, Israel | |
| 4x100m medley relay | 3:44.84 | Will Grant (53.89)Josh Matheny (59.31)Torri Huske (58.04)Gretchen Walsh (53.60) | United States | 21 August 2019 | 2019 Championships | Budapest, Hungary | |