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 (now World Aquatics), and were initially established in March 2014 and based on the meet records from the Junior Worlds meet.[1]

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.[2] 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.

Long Course (50 m)

Boys

Event Time Name Nationality Date Meet Location Ref
50m freestyle 21.75 h, = Michael Andrew  United States 25 August 2017 World Junior Championships Indianapolis, United States [3]
50m freestyle 21.75 = Michael Andrew  United States 26 August 2017 World Junior Championships Indianapolis, United States [4]
100m freestyle 46.86 WR David Popovici  Romania 13 August 2022 European Championships Rome, Italy [5]
200m freestyle 1:42.97 David Popovici  Romania 15 August 2022 European Championships Rome, Italy [6]link
400m freestyle 3:44.31 Petar Mitsin  Bulgaria 9 July 2023 European Junior Championships Belgrade, Serbia [7]
400m freestyle 3:40.59 not ratified,
fastest all-time junior		 Ian Thorpe  Australia 16 September 2000 Olympic Games Sydney, Australia
800m freestyle 7:43.37 Lorenzo Galossi  Italy 13 August 2022 European Championships Rome, Italy [8]
1500m freestyle 14:46.09 Franko Grgić  Croatia 25 August 2019 World Junior Championships Budapest, Hungary [9]
50m backstroke 24.00 Kliment Kolesnikov  Russia 4 August 2018 European Championships Glasgow, United Kingdom [10]
100m backstroke 52.53 Kliment Kolesnikov  Russia 6 August 2018 European Championships Glasgow, United Kingdom [11]
200m backstroke 1:55.14 Kliment Kolesnikov  Russia 28 July 2017 World Championships Budapest, Hungary [12]
200m backstroke 1:54.77 not ratified,
fastest all-time junior		 Ryosuke Irie  Japan 7 June 2008 Japan Open Tokyo, Japan
50m breaststroke 26.97 h Nicolò Martinenghi  Italy 4 April 2017 Italian Championships Riccione, Italy [13]
100m breaststroke 59.01 sf Nicolò Martinenghi  Italy 23 August 2017 World Junior Championships Indianapolis, United States [14]
200m breaststroke 2:08.04 Dong Zhihao  China 28 July 2023 World Championships Fukuoka, Japan [15]
200m breaststroke 2:07.35 not ratified Qin Haiyang  China 4 September 2017 National Games Tianjin, China [16]
200m breaststroke 2:07.01 not ratified,
fastest all-time junior		 Akihiro Yamaguchi  Japan 15 September 2012 National Sports Festival Gifu, Japan
50m butterfly 22.96 Diogo Ribeiro  Portugal 3 September 2022 World Junior Championships Lima, Peru [17]link
100m butterfly 50.62 Kristóf Milák  Hungary 29 July 2017 World Championships Budapest, Hungary [18]
200m butterfly 1:53.79 Kristóf Milák  Hungary 30 June 2017 European Junior Championships Netanya, Israel [19]
200m butterfly 1:52.71 not ratified,
fastest all-time junior		 Kristóf Milák  Hungary 28 March 2018 Hungarian Championships Debrecen, Hungary [20]
200m
individual medley 		1:56.99 sf Hubert Kós  Hungary 19 May 2021 European Championships Budapest, Hungary [21]
200m
individual medley 		1:55.94 not ratified,
fastest all-time junior		 Michael Phelps  United States 9 August 2003 USA Championships College Park, United States [22]
400m
individual medley 		4:10.02 Ilya Borodin  Russia 23 May 2021 European Championships Budapest, Hungary [23]
400m
individual medley 		4:08.94 not ratified,
fastest all-time junior		 Kosuke Hagino  Japan 28 July 2012 Olympic Games London, United Kingdom
4 × 100m
freestyle relay 		3:15.49
 United States 4 September 2023 World Junior Championships Netanya, Israel [24]
4 × 200m
freestyle relay 		7:08.37
 United States 23 August 2019 World Junior Championships Budapest, Hungary [25]
4 × 100m
medley relay 		3:33.19
 Russia 25 August 2019 World Junior Championships Budapest, Hungary [26]
Legend: # – Record awaiting ratification by FINA; WR – World record;
Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

Girls

Event Time Name Nationality Date Meet Location Ref
50m freestyle 24.17 Claire Curzan  United States 14 May 2021 TAC Titans Spring Invitational Meet Cary, United States [27]
50m freestyle 23.99 not ratified,
fastest all-time junior		 Cate Campbell  Australia 2 August 2009 World Championships Rome, Italy [28]
100m freestyle 52.70 Penny Oleksiak  Canada 11 August 2016 Olympic Games Rio de Janeiro, Brazil [29]
100m freestyle 52.49 not ratified,
fastest all-time junior		 Mollie O'Callaghan  Australia 18 May 2022 Australian Championships Adelaide, Australia
200m freestyle 1:53.65 Summer McIntosh  Canada 26 July 2023 World Championships Fukuoka, Japan [30]
400m freestyle 3:56.08 Summer McIntosh  Canada 28 March 2023 Canadian Trials Toronto, Canada [31]
800m freestyle 8:11.00 Katie Ledecky  United States 22 June 2014 Woodlands Senior Invitational Meet Shenandoah, United States [32]
800m freestyle 8:07.39 not ratified,
fastest all-time junior		 Katie Ledecky  United States 8 August 2015 World Championships Kazan, Russia
1500m freestyle 15:28.36 Katie Ledecky  United States 24 August 2014 Pan Pacific Championships Gold Coast, Australia [33]
1500m freestyle 15:25.48 not ratified,
fastest all-time junior		 Katie Ledecky  United States 4 August 2015 World Championships Kazan, Russia
50m backstroke 27.49 Minna Atherton  Australia 7 February 2016 Brisbane Sprint Championships Brisbane, Australia [34]
50m backstroke 27.22 not ratified,
fastest all-time junior		 Fu Yuanhui  China 1 April 2013 Chinese Nationals Zhengzhou, China
100m backstroke 57.57 r Regan Smith  United States 28 July 2019 World Championships Gwangju, South Korea [35]
200m backstroke 2:03.35 sf Regan Smith  United States 26 July 2019 World Championships Gwangju, South Korea [36]
50m breaststroke 29.30 sf, WR Benedetta Pilato  Italy 22 May 2021 European Championships Budapest, Hungary [37]
100m breaststroke 1:04.35 sf, ER Rūta Meilutytė  Lithuania 29 July 2013 World Championships Barcelona, Spain [38][39]
200m breaststroke 2:19.64 Viktoriya Zeynep Gunes  Turkey 30 August 2015 World Junior Championships Singapore, Singapore [40]
50m butterfly 25.46 Rikako Ikee  Japan 26 August 2017 World Junior Championships Indianapolis, United States [41]
50m butterfly 25.11 not ratified,
fastest all-time junior		 Rikako Ikee  Japan 10 June 2018 Mare Nostrum Canet-en-Roussillon, France
100m butterfly 56.43 Claire Curzan  United States 14 May 2021 TAC Titans Spring Invitational Meet Cary, United States
100m butterfly 56.20 not
ratified		 Claire Curzan  United States 10 April 2021 TAC Titans Premier Invitational Cary, United States [42]
100m butterfly 56.43 not
ratified		 Claire Curzan  United States 14 June 2021 US Olympic Team Trials - Wave II Omaha, United States [43]
100m butterfly 56.06 not ratified,
fastest all-time junior		 Sarah Sjöström  Sweden 27 July 2009 World Championships Rome, Italy [44]
200m butterfly 2:04.06 Summer McIntosh  Canada 27 July 2023 World Championships Fukuoka, Japan [45]
200m individual medley 2:06.89 Summer McIntosh  Canada 30 March 2023 Canadian Trials Toronto, Canada [46]
400m individual medley 4:25.87 WR Summer McIntosh  Canada 1 April 2023 Canadian Trials Toronto, Canada [47]
4 × 100m
freestyle relay 		3:36.19
 Canada 27 August 2017 World Junior Championships Indianapolis, United States [48]
4 × 200m
freestyle relay 		7:51.47
 Canada 23 August 2017 World Junior Championships Indianapolis, United States [49]
4 × 100m
medley relay 		3:58.38
 Canada 28 August 2017 World Junior Championships Indianapolis, United States [50]
Legend: # – Record awaiting ratification by FINA;
Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

Mixed

Event Time Name Nationality Date Meet Location Ref
4 × 100 m freestyle relay 3:24.29
  • Flynn Southam
     (48.58)
  • Edward Sommerville
     (48.54)
  • Olivia Wunsch
     (53.62)
  • Milla Jansen
     (53.55)
  Australia 6 September 2023 World Junior Championships Netanya, Israel [51]
4 × 100 m medley relay 3:44.84
 United States 21 August 2019 World Junior Championships Budapest, Hungary [52]
Legend: # – Record awaiting ratification by FINA; WR – World record;
Records not set in finals: h – heat

Short Course (25 m)

Boys

Event Time Name Nationality Date Meet Location Ref
50m freestyle 20.98 Kenzo Simons  Netherlands 22 December 2019 Dutch Championships Tilburg, Netherlands [53]
50m freestyle 20.70 rh,
not ratified,
fastest all-time
junior		 Evgeny Sedov  Russia 6 December 2014 World Championships Doha, Qatar
100m freestyle 45.64 David Popovici  Romania 15 December 2022 World Championships Melbourne, Australia [54]
200m freestyle 1:40.65 Matthew Sates  South Africa 3 October 2021 World Cup Berlin, Germany [55]
200m freestyle 1:40.08 not ratified,
fastest all-time
junior		 Danila Izotov  Russia 13 December 2009 European Championships Istanbul, Turkey
400m freestyle 3:37.92 Matthew Sates  South Africa 7 October 2021 World Cup Budapest, Hungary [56]
400m freestyle 3:35.64 not ratified,
fastest all-time
junior		 Ian Thorpe  Australia 2 April 1999 World Championships Hong Kong, Hong Kong
800m freestyle 7:36.00 Sven Schwarz  Germany 16 November 2019 German Championships Berlin, Germany [57]
1500m freestyle 14:27.78 Gregorio Paltrinieri  Italy 24 November 2012 European Championships Chartres, France
1500m freestyle 14:19.55 not ratified,
fastest all-time
junior		 Grant Hackett  Australia 27 September 1998 Australian Championships Perth, Australia
50m backstroke 22.52 Isaac Cooper  Australia 15 December 2022 World Championships Melbourne, Australia [58]
100m backstroke 48.90 Kliment Kolesnikov  Russia 22 December 2017 Vladimir Salnikov Cup Saint Petersburg, Russia [59]
200m backstroke 1:48.02 Kliment Kolesnikov  Russia 13 December 2017 European Championships Copenhagen, Denmark [60]
50m breaststroke 25.85 Simone Cerasuolo  Italy 30 November 2021 Italian Championships Riccione, Italy [61][62]
100m breaststroke 56.66 Simone Cerasuolo  Italy 1 December 2021 Italian Championships Riccione, Italy [63][64]
200m breaststroke 2:03.23 Akihiro Yamaguchi  Japan 14 December 2012 World Championships Istanbul, Turkey
50m butterfly 22.34 Andrei Minakov  Russia 18 December 2020 Russian Championships Saint Petersburg, Russia [65]
100m butterfly 49.53 Li Zhuhao  China 19 November 2017 World Cup Singapore, Singapore [66]
200m butterfly 1:49.61 Chen Juner  China 28 October 2022 Chinese Championships Beijing, China [67]
100m individual medley 50.63 Kliment Kolesnikov  Russia 14 December 2018 World Championships Hangzhou, China [68]
200m individual medley 1:51.45 Matthew Sates  South Africa 2 October 2021 World Cup Berlin, Germany [69]
400m individual medley 3:56.47 Ilya Borodin  Russia 20 December 2021 World Championships Kazan, Russia [70]
4×50m freestyle relay 1:27.46
4 × 100m freestyle relay 3:12.56
4 × 200m freestyle relay 6:59.66
4×50m medley relay 1:38.29
4 × 100m medley relay 3:28.05
Legend: # – Record awaiting ratification by FINA; WR – World record; AS – Asian record;
Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

Girls

Event Time Name Nationality Date Meet Location Ref
50m freestyle 23.69 r Anastasiya Shkurdai  Belarus 18 December 2020 Belarusian Championships Brest, Belarus [71]
100m freestyle 51.45 AM Kayla Sanchez  Canada 14 December 2018 Swim England Winter Championships Sheffield, United Kingdom [72]
200m freestyle 1:52.59 Bella Sims  United States 4 November 2022 World Cup Indianapolis, United States [73]
200m freestyle 1:52.50 not ratified Taylor Ruck  Canada 6 December 2016 World Championships Windsor, Canada [74]
200m freestyle 1:51.38 not ratified,
fastest all-time
junior		 Ariarne Titmus  Australia 11 December 2018 World Championships Hangzhou, China
400m freestyle 3:52.80 AM Summer McIntosh  Canada 28 October 2022 World Cup Toronto, Canada [75][76]
800m freestyle 7:59.44 AS Wang Jianjiahe  China 6 October 2018 World Cup Budapest, Hungary [77]
1500m freestyle 15:42.05 Katie Grimes  United States 4 November 2022 World Cup Indianapolis, United States [78]
50m backstroke 26.13 Olivia Smoliga  United States 16 December 2012 World Championships Istanbul, Turkey
50m backstroke 25.49 not ratified,
fastest all-time
junior		 Mollie O'Callaghan  Australia 14 December 2022 World Championships Melbourne, Australia
100m backstroke 55.75 Bella Sims  United States 4 November 2022 World Cup Indianapolis, United States [79]
100m backstroke 55.62 not ratified,
fastest all-time
junior		 Mollie O'Callaghan  Australia 17 December 2022 World Championships Melbourne, Australia
200m backstroke 2:00.03 Missy Franklin  United States 22 October 2011 World Cup Berlin, Germany
50m breaststroke 28.81 Benedetta Pilato  Italy 21 November 2020 International Swimming League Budapest, Hungary [80]
50m breaststroke 28.81 not ratified Ruta Meilutyte  Lithuania 3 December 2014 World Championships Doha, Qatar
100m breaststroke 1:02.36 Ruta Meilutyte  Lithuania 12 October 2013 World Cup Moscow, Russia
200m breaststroke 2:16.88 Evgeniia Chikunova  Russia 5 November 2021 European Championships Kazan, Russia [81][82]
50m butterfly 24.55 Claire Curzan  United States 19 December 2021 World Championships Abu Dhabi, United Arab Emirates [83]
100m butterfly 55.39 Claire Curzan  United States 21 December 2021 World Championships Abu Dhabi, United Arab Emirates [84]
200m butterfly 2:02.96 Suzuka Hasegawa  Japan 14 January 2017 New Year Meet Tokyo, Japan
100m individual medley 57.59 Anastasiya Shkurdai  Belarus 22 November 2020 International Swimming League Budapest, Hungary [85]
200m individual medley 2:04.48 Yu Yiting  China 20 December 2021 World Championships Abu Dhabi, United Arab Emirates [86]
400m individual medley 4:21.49 Summer McIntosh  Canada 29 October 2022 World Cup Toronto, Canada [87][88]
4×50m freestyle relay 1:40.59
4 × 100m freestyle relay 3:32.63
4 × 200m freestyle relay 7:43.73
4×50m medley relay 1:44.43 not ratified
  • Wan Letian
     (26.42)
  • Tang Qianting
     (28.96)
  • Yu Yiting
     (25.28)
  • Cheng Yujie
     (23.78)
  China 17 December 2021 World Championships Abu Dhabi, United Arab Emirates [89]
4 × 100m medley relay 3:49.16
Legend: # – Record awaiting ratification by FINA; WR – World record; AM – Americas record; AS – Asian record; CR – Commonwealth record;
Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

Mixed

Event Time Name Nationality Date Meet Location Ref
4×50m freestyle relay 1:31.50 not ratified
  • Daniel Diehl
     (22.07)
  • Quintin McCarty
     (21.35)
  • Kristina Paegle
     (23.78)
  • Carly Novelline
     (24.30)
  United States 2 October 2021 World Cup Berlin, Germany [90]
4×50m medley relay 1:41.21
 United States 9 October 2021 World Cup Budapest, Hungary [91]
Legend: # – Record awaiting ratification by FINA; WR – World record;
Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg; b – B final; † – en route to final mark; tt – time trial

References

General
Specific
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