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 the 31st December of the year of the competition.[1] 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 the 31st of December of the year of the competition.[2]
| Number | Year | Location | Dates | Number of Swimmers | Number of Countries | Events | Top Nation | |
|---|---|---|---|---|---|---|---|---|
| 1 | 22–27 August | 685 | 81 | 40 | ||||
| 2 | 8–12 July | 480 | 61 | 40 | ||||
| 3 | 16–21 August | 528 | 58 | 40 | ||||
| 4 | 26–31 August | 900 | 95 | 42 | ||||
| 5 | Kallang, Singapore[3] | 25–30 August | 700 | 87 | 42 | |||
| 6 |  Indianapolis, USA | 23–28 August | 619 | 90 | 42 | |||
| 7 | 20–25 August | 814 | 126 | 42 | ||||
| 8 |  Lima, Peru[4] | 30 August – 4 September | 509 | 87 | 42 | |||
| 9 | 4–9 September | 648 | 93 | 42 |
Last updated after the 2023 Championships
All records were set in finals unless noted otherwise. All times are swum in a long-course (50m) pool.