Mollie O'Callaghan

Mollie O'Callaghan
OAM
Personal information
Full nameMollie Grace O'Callaghan
Born (2004-04-02) 2 April 2004
South Brisbane, Queensland, Australia[1]
Sport
SportSwimming
StrokesFreestyle
ClubSt Peters Western Swim Club
CoachDean Boxall
Medal record
Women's swimming
Representing  Australia
Event 1st 2nd 3rd
Olympic Games 5 1 2
World Championships (LC) 11 6 0
World Championships (SC) 3 3 1
Commonwealth Games 5 2 0
World Junior Championships 0 1 0
Total 24 13 3
Olympic Games
2020 Tokyo 4×100 m freestyle
2020 Tokyo 4×100 m medley
2024 Paris 200 m freestyle
2024 Paris 4×100 m freestyle
2024 Paris 4×200 m freestyle
2024 Paris 4×100 m medley
2020 Tokyo 4×200 m freestyle
2024 Paris 4×100 m mixed medley
World Championships (LC)
2022 Budapest 100 m freestyle
2022 Budapest 4×100 m freestyle
2022 Budapest 4×100 m mixed freestyle
2023 Fukuoka 100 m freestyle
2023 Fukuoka 200 m freestyle
2023 Fukuoka 4×100 m freestyle
2023 Fukuoka 4×200 m freestyle
2023 Fukuoka 4×100 m mixed freestyle
2025 Singapore 200 m freestyle
2025 Singapore 4×100 m freestyle
2025 Singapore 4×200 m freestyle
2022 Budapest 200 m freestyle
2022 Budapest 4×200 m freestyle
2022 Budapest 4×100 m medley
2023 Fukuoka 4×100 m medley
2025 Singapore 100 m freestyle
2025 Singapore 4×100 m medley
World Championships (SC)
2022 Melbourne 4×100 m freestyle
2022 Melbourne 4×200 m freestyle
2022 Melbourne 4×50 m medley
2022 Melbourne 100 m backstroke
2022 Melbourne 4×50 m freestyle
2022 Melbourne 4×100 m medley
2022 Melbourne 50 m backstroke
Commonwealth Games
2022 Birmingham 100 m freestyle
2022 Birmingham 4×100 m freestyle
2022 Birmingham 4×200 m freestyle
2022 Birmingham 4×100 m medley
2022 Birmingham 4×100 m mixed freestyle
2022 Birmingham 200 m freestyle
2022 Birmingham 50 m backstroke
World Junior Championships
2019 Budapest 4×100 m freestyle

Mollie Grace O'Callaghan OAM (born 2 April 2004) is an Australian swimmer and the reigning Olympic champion in the 200 m freestyle. She was the 2023 world champion in the women's 100m and 200m freestyle individual events, and part of the world champion 4 × 100 m and 4 × 200 m Australian women's relay teams together with 4 × 100 m mixed relay team. She former held the world record in the long course 200 m freestyle, and currently holds the world record for the short course 200 m freestyle.

O'Callaghan also won two gold and one bronze medals at the 2020 Summer Olympics as a heats swimmer in relay events and gold medal in the 200 m freestyle and 4 × 100 metre freestyle relay at the 2024 Summer Olympics.

Career

2021

O'Callaghan swam for the Australian team in the preliminaries of all three women's relays at the 2020 Summer Olympics in Tokyo, receiving two gold medals and one bronze for her contribution. Swimming the 1st leg for Australia in the heats of the 4×100 m freestyle relay, she posted a time of 53.08 and received a gold medal after the Australian team won the final.[2]

In the 4×200 m freestyle relay preliminaries, O'Callaghan swam a junior world record of 1:55.11 when swimming the lead off leg. Her time would have placed her fifth in the 200 m freestyle final.[3] However, because the Australian coaches had previously decided to use four fresh swimmers in the final, O'Callaghan was not selected for the final where Australia finished third.[4]

In a heat of the 4×100 m medley relay, O'Callaghan again posted a competitive time; her anchor leg split was 52.35, only 0.24 seconds slower than the fastest freestyle split in the final by Cate Campbell.

2022

O'Callaghan competed at the 2022 World Championships in Budapest. Swimming the first leg of the 4×100 m freestyle relay, she split 52.70. Australia won the gold medal in 3:30.95.[5] In the 200 m freestyle, she won the silver medal in a time of 1:55.22.[6] She then competed in the 4×200 m freestyle relay, swimming the anchor leg in a time of 1:55.94. Australia finished with the silver medal, recording 7:43.86.[7] In the 100 m freestyle, O'Callaghan won the gold medal in a time of 52.67.[8] She then swam the anchor leg of the mixed 4×100 m freestyle relay, splitting 52.03. Australia won the gold medal in a world record time of 3:19.38.[9] She concluded the championships with a silver medal in the 4×100 m medley relay.[10]

Weeks later, O'Callaghan competed at the Swimming at the 2022 Commonwealth Games in Birmingham. She won the silver medal in the 200 m freestyle in a time of 1:54.01, which placed her as the sixth-fastest swimmer in the event's history. She finished 0.12 seconds behind the gold medalist.[11] Later in the session, she swam the third leg of the mixed 4×100 m freestyle relay, where Australia won the gold medal in a games record of 3:21.18.[12] The following day, she competed in the women's 4×100 m freestyle relay, splitting 52.66 on the third leg. Australia won the gold medal in a time of 3:30.64.[13] On the third day, O'Callaghan swam the third leg of the 4×200 m freestyle relay, splitting 1:54.80. Australia won the gold medal in a time of 7:39.29, which broke the world record of 7:40.33 set by China in 2021.[14] O'Callaghan later competed in the 100 m freestyle, recording 52.63 to win her first individual gold of the competition.[15] On the final day, she competed in two events. The first of which was the 50 m backstroke, where she won the silver in a time of 27.47.[16] She then anchored the women's 4×100 m medley relay to the gold medal.[17]

O'Callaghan was selected for the 2022 World Championships (25 m) in Melbourne. Her first event was the 4×100 m freestyle relay, where she led off in a time of 52.11, with Australia recording 3:25.43 to win the gold medal. This was a new world record, surpassing the Netherlands' mark of 3:26.53 from 2014.[18] O'Callaghan competed in two events on the second day. First was the 100 m backstroke, where she finished in a time of 55.62 to win the silver medal. Later in the night, she swam the second leg of the 4×200 m freestyle relay, recording a split of 1:52.83. Australia won the gold medal in world record time of 7:30.87, surpassing the Netherlands' mark of 7:32.88 from 2014.[19][20] The following day, O'Callaghan swam in the 4×50 m freestyle relay, recording 24.01 on the third leg. Australia won the silver medal in an overall time of 1:34.23, which was a new Oceanian record.[21] On day four, O'Callaghan won the bronze medal in the 50 m backstroke in an Oceanian record time of 25.61.[22] On day five, O'Callaghan swam the first leg of the 4×50 m medley relay, recording 25.49 to break the Oceanian record in the 50 m backstroke again. Australia won the gold medal in 1:42.35 to break the world record by 0.03 seconds.[23] O'Callaghan's final swim was the 4×100 m medley relay, swimming the backstroke leg in the heats before she was replaced by Kaylee McKeown in the final. Australia went on to win the silver medal.[24][25]

2023

O'Callaghan was selected for the 2023 World Championships in Fukuoka. Swimming the first leg of the 4×100 m freestyle relay, she split 52.08, becoming the sixth-fastest woman of all time in the 100 m freestyle. Australia won the gold medal in 3:27.96, breaking their previous world record of 3:29.69 from 2021.[26] O'Callaghan competed in the 200 m freestyle, trailing Ariarne Titmus for the first three laps of the final. O'Callaghan took the lead during the final lap, winning the gold medal by 0.16 seconds. She went 1:52.85, breaking Federica Pellegrini's world record of 1:52.98 from 2009.[27] O'Callaghan competed in the 4×200 m freestyle relay, splitting 1:53.66 on the first leg. Australia won the gold medal in a world record time of 7:37.50.[28] O'Callaghan then recorded 52.16 in the 100 m freestyle to defend her world title in the event, becoming the first woman to win both the 100 and 200 m freestyle events at a single world championships.[29] She once again anchored the mixed 4×100 m freestyle relay to a new world record, with the team recording a time of 3:18.83.[30] On the final day of competition, O'Callaghan anchored the 4×100 m medley relay to the silver medal.[31]

2024

O'Callaghan competed at the 2024 Australian Trials in Brisbane. She came second in the 100 m backstroke with a time of 57.88, becoming the fourth-fastest woman in history.[32] Her next event was the 200 m freestyle, which served as a rematch with Titmus. They were under world record pace for the entirely of the race, separated by no more than 0.25 seconds. Titmus finished first to break the world record in 1:52.23. O'Callaghan recorded 1:52.48 for the second-fastest time in history.[33] O'Callaghan later won the 100 m freestyle in a time of 52.33.[34] O'Callaghan later dropped the 100 m backstroke from her Olympic program.[35]

On the first night of swimming in Paris, O'Callaghan competed in the 4×100m freestyle relay, splitting 52.24 on the first leg. Australia won the gold medal in 3:28.92, which was an Olympic record and the second-fastest time in history. It was Australia's fourth consecutive Olympic gold medal in the event.[36]

O'Callaghan once again went head-to-head with Titmus in the 200 m freestyle. O'Callaghan trailed the field in the early stages of the race, but took the lead in the final lap to win the gold medal. She recorded an Olympic record time 1:53.27, surpassing Titmus' mark of 1:53.50 from the Tokyo Olympics. This was Australia's first gold-silver finish in any Olympic event since 2004.[37][38]

Although O'Callaghan went into the 100 m freestyle as the two-time world champion, she finished fourth in the event. The result was considered one of the biggest surprises of the Olympics.[39]

O'Callaghan swam the first leg of the 4×200 m freestyle relay, splitting 1:53.52 to give Australia the lead. They won the gold medal in 7:38.08, which was a new Olympic record and the second-fastest time in history.[40][41] O'Callaghan later swam the anchor leg of the mixed 4×100 m medley relay, contributing a split of 52.01. Australia won the bronze medal in an Oceanian record time of 3:38.76.[42] Her final event was the women's 4×100 m medley, where she swam the anchor leg and won the silver medal.[43]

After the Olympics, O'Callaghan made the decision to take a hiatus for the rest of the year.[44]

2025

Due to her hypermobility, O'Callaghan again sustained a dislocated knee injury in January, affecting her training for several months including water-based training.[45]

O'Callaghan competed at the 2025 World Championships in Singapore. Her first event was the 4×100m freestyle relay. She led off in 52.79 to give Australia the lead, and the team went on to win the gold medal. Notably their American rivals, who were suffering from gastroenteritis, saw their anchor, Gretchen Walsh, withdraw before the final.[46] In the 200 m freestyle final, O'Callaghan again emphasised the second half of the race, pulling away at the 100 m mark. She won the gold medal in 1:53.48.[47] The following day, O'Callaghan swam the anchor leg of the 4×200 m freestyle relay. She dove in with a lead of 0.39 seconds, and was matched up against Katie Ledecky. O'Callaghan split 1:53.44 to win the gold medal in 7:39.35. This marked O'Callaghan's third gold medal of the championships and 11th gold medal overall, equalling Ian Thorpe's record for the most world championship gold medals won by an Australian swimmer.[48][49] O'Callaghan won the silver medal in the 100 m freestyle, finishing 0.12 behind defending world champion Marrit Steenbergen. Her final event was the 4×100 m medley relay, where she swam the anchor leg in 52.23. Australia won the silver medal in an overall time of 3:52.67.[50]

In October, O'Callaghan competed in the 2025 World Cup. At the Carmel stop, she went 1:50.77 in the short course 200 m freestyle to become the third fastest woman in the event's history.[51] At the Westmont stop, O'Callaghan went 1:49.77 in the same event. This broke Siobhán Haughey's world record of 1:50.31 from 2021.[52] At the Toronto, where O'Callaghan went 1:49.36 to break the world record again.[53]

Results in major championships

Meet 100 free 200 free 50 back 100 back 4×50 free 4×100 free 4×200 free 4×50 medley 4×100 medley 4×100 Mixed free 4×100 Mixed medley
WJC 2019 4th 4th 4th 5th 5th
OG 2021
WC 2022 DNS
CG 2022 DNS
SCW 2022
WC 2023 DNS
OG 2024 4th
WC 2025 Q DNS

Career best times

Long course metres (50 m pool)

As of 12 June 2024[54]
Event Time Meet Location Date Notes
50 m freestyle 24.49 Australian Trials Brisbane 15 June 2024
100 m freestyle 52.08 r World Championships Fukuoka 23 July 2023
200 m freestyle 1:52.48 Australian Trials Brisbane 26 July 2023
400 m freestyle 4:07.21 NSW State Championships Sydney 11 March 2023
50 m backstroke 27.16 Australian Championships Gold Coast 19 April 2024
100 m backstroke 57.88 Australian Trials Brisbane 11 June 2024
200 m backstroke 2:08.48 Australian Championships Adelaide 21 May 2022
50 m butterfly 27.72 Queensland Championships Brisbane 11 December 2023
100 m butterfly 58.98 Queensland Championships Brisbane 11 December 2023
200 m butterfly 2:13.74 Queensland Championships Brisbane 12 December 2023
Legend: WR – World record; OC – Oceanian record; CR – Commonwealth record; NR – Australian 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

Short course metres (25 m pool)

As of 11 October 2025[54]
Event Time Meet Location Date Notes
50 m freestyle 23.81 World Cup Westmont 17 October 2025
100 m freestyle 50.82 World Cup Toronto 25 October 2025
200 m freestyle 1:49.36 World Cup Toronto 24 October 2025 WR
50 m backstroke 25.42 World Cup Toronto 23 October 2025
100 m backstroke 55.62 World Championships Melbourne 14 December 2022
200 m backstroke 2:05.45 Queensland Championships Brisbane 25 September 2020
50 m butterfly 27.87 State Teams Championships Canberra 4 October 2019
Legend: WR – World record; OC – Oceanian record; CR – Commonwealth record; NR – Australian 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

World records

Long course metres

No. Event Time Meet Location Date Status Ref
1 4×100 m mixed freestyle relay[a] 3:19.38 World Championships Budapest, Hungary 24 June 2022 Former [55]
2 4×200 m freestyle relay[b] 7:39.29 Commonwealth Games Birmingham, United Kingdom 31 July 2022 Former
3 4×100 m freestyle relay[c] 3:27.96 World Championships Fukuoka, Japan 23 July 2023 Current [26]
4 200 m freestyle 1:52.85 World Championships Fukuoka, Japan 26 July 2023 Former [27]
5 4×200 m freestyle relay[d] 7:37.50 World Championships Fukuoka, Japan 27 July 2023 Current [28]
6 4×100 m mixed freestyle relay[e] 3:18.83 World Championships Fukuoka, Japan 29 July 2023 Former [30]
Legend: OC – Oceanian record; NR – Australian 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

a split 52.03 (4th leg); with Jack Cartwright (1st leg), Kyle Chalmers (2nd leg), Madison Wilson (3rd leg)
b split 1:54.80 (3rd leg); with Madison Wilson (1st leg), Kiah Melverton (2nd leg), Ariarne Titmus (4th leg)
c split 52.08 (1st leg); with Shayna Jack (2nd leg), Meg Harris (3rd leg), Emma McKeon (4th leg)
d split 1:53.66 (1st leg); with Shayna Jack (2nd leg), Brianna Throssell (3rd leg), Ariarne Titmus (4th leg)
e split 51.71 (4th leg); with Jack Cartwright (1st leg), Kyle Chalmers (2nd leg), Shayna Jack (3rd leg)

Short course metres

No. Event Time Meet Location Date Status Ref
1 4×100 m freestyle relay[a] 3:25.43 World Championships Melbourne, Australia 13 December 2022 Former [18]
2 4×200 m freestyle relay[b] 7:30.87 World Championships Melbourne, Australia 14 December 2022 Former [20]
3 4×50 m medley relay[c] 1:42.35 World Championships Melbourne, Australia 17 December 2022 Current [23]
4 200 m freestyle 1:49.77 World Cup Westmont, United States 18 October 2025 Former [52]
5 200 m freestyle 1:49.36 World Cup Toronto, Canada 24 October 2025 Current [53]

a split 52.19 (1st leg); with Madison Wilson (2nd leg), Meg Harris (3rd leg), Emma McKeon (4th leg)
b split 1:52.83 (2nd leg), with Madison Wilson (1st leg), Leah Neale (3rd leg), Lani Pallister (4th leg)
c split 25.49 (backstroke leg); with Chelsea Hodges (breaststroke leg), Emma McKeon (butterfly leg), Madison Wilson (freestyle leg)

Olympic records

Long course metres

No. Event Time Meet Location Date Age Status Notes Ref
1 4×100 m freestyle relay[a] 3:28.92 2024 Summer Olympics Paris, France 27 July 2024 20 Current [36]
2 200 m freestyle 1:53.27 2024 Summer Olympics Paris, France 29 July 2024 20 Current [38]
3 4×200 m freestyle relay[b] 7:38.08 2024 Summer Olympics Paris, France 1 August 2024 20 Current [40]
Legend: WR – World record; OC – Oceanian record; NR – Australian 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

a split 52.24 (1st leg); with Shayna Jack (2nd leg), Emma McKeon (3rd leg), Meg Harris (4th leg)
b split 1:53.52 (1st leg) with Lani Pallister (2nd leg), Brianna Throssell (3rd leg), Ariarne Titmus (4th leg)

Honours

See also

Notes

References

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  2. ^ "Tokyo 2020 Olympics day 1 prelims". SwimSwam. 24 July 2021. Retrieved 23 June 2022.
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