List of Junior world records in swimming

The Junior World Records in Swimming are the fastest times ever swum by a "junior" swimmer, with junior defined as the following ages (age as of December 31 of the year of the swim):

These records are kept/maintained by the FINA, and were initially established in March 2014 and based on the meet records from the Junior Worlds meet.

Note: in some cases, there were existing world records (e.g. Katie Ledecky's 400, 800 and 1500 m freestyle, Rūta Meilutytė's 100 m breaststroke) that were not considered for these records (but were faster). Likewise more historical times by juniors were also not considered (e.g. Mary T. Meagher's 2:05.96 in the 200 m butterfly).

Long Course records can be established by breaking the initial time at a meet after April 1, 2014. FINA World Junior Records in 25m pool are recognised starting on January 1, 2015.

Records are recognized for long course (50 m pool) and short course (25 m pool) in the following events:

Also recognized are mixed relay records for 4 × 100 medley and free relays.

All records were swum in finals unless noted otherwise.

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