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Sophie O'Sullivan
Sophie O'Sullivan (born 2001) is an Australian-born Irish athlete. She won a silver medal in the 800 metres at the 2018 European Athletics U18 Championships in Győr, Hungary. O'Sullivan won 1500 metres gold at the 2023 European Athletics U23 Championships in Espoo, Finland. She represented the Washington Huskies at the University of Washington in NCAA track and field competitions. In 2025, she won the NCCA outdoor 1500 m championships in Eugene, Oregon in her final race as a Washington Husky.
Sophie is the daughter of Irish World champion and Olympic Silver medallist Sonia O'Sullivan, and Australian track and field coach Nic Bideau. She has one sister, Ciara.
At the University of Washington Preview Meet on 14 January at the Dempsey Arena in Seattle, O'Sullivan achieved personal bests over the mile (4.36.67, for 6th in her section, and sixth fastest time overall) and the 800 metres (2.05.87, for 1st in her section and 5th overall). She also ran a leg of the 4 X 400 metres relay, where UW finished 4th of 15 teams in 3.56.4. At the University of Washington Invitational Meet on 28 January she ran 3000 m in 9.03.91, to finish second behind Emily Venters of Utah. O'Sullivan's time was 6th fastest in UW history. She also ran the anchor leg in the 4 by 400 relay, where her team finished 2nd in 3.45.21, behind San Diego State.
On 3 February, as part of the University of Washington distance medley relay team, alongside Marlena Preigh, Carley Thomas, and Anna Gibson, she helped the Huskies to victory in the 2023 Bruce Lehane and Scarlet White Women's 4000 m distance medley relay at Boston University Track and Tennis Center, with a 1200 m time of 3.16.24. UW's time of 10:46.62 was a new NCCA record. At the same meet, she finished 8th in the mile race in 4.39.35. At the Huskey Classic in the Dempsey Arena on 11 February O'Sullivan took the lead in the top heat of the women's mile with 200-meters to go and held on to win, lowering her mile PR to 4:33.24, and tying for the No. 5 time in school history. Shortly afterwards, she finished 19th fastest over 800 metres in 2.08.94.
At the Stanford Invitational in Pao Alto, California, on 1 April, O'Sullivan finished 2nd overall in the 1500 metres in 4.17.46. She followed this up on 22 April, again in Pao Alto, CA, as she ran 1500 metres in a 4 X 1500 metres relay in which Washington placed third in 17.15.64. At the Penn Relays on 29 April she helped UW to two top-three finishes, splitting 4:18 as the 4 × 1500 m relay took third, and splitting 2:07 to help the 4 × 800 m relay place second.
On 28 May at the NCAA Preliminaries in Sacramento, CA, O'Sullivan won her 1500 heat in a new PB of 4.08.06 to qualify for the NCCA finals in Austin, Texas on 7–10 June. Her time was the fastest over the distance in University of Washington history, eighth on the Irish all-time list, and 11th on the NCCA all-time list. On 8 June O'Sullivan was fastest qualifier in the 1500 m heats at the NCCA finals in Austin, Texas, running 4:09.58. She was unable to maintain this form in the final on 10 June, finishing 12th in 4.22.81. The race was won by Harvard's Maia Ramsden in 4.08.60.
At the Irish national under 23 Championships in Tullamore, Co. Offaly on 2 July, O'Sullivan scored a double, striking gold at both 800 m (2.10.04) and 1500 m (4.27.02). On 22 June 2023, she won the Division 3 1500m in 4.27.96 to help Ireland win promotion at the European Athletics Team Championships Third Division in Kraków.
On 16 July, O'Sullivan won the 1500 m at the European Under 23 Championships in Espoo, Finland. Her winning time was a new personal best of 4.07.18. She finished ahead of Ireland's Sarah Healy (4:07.36) and Britain's Shannon Flockhart (4:08.37). In the Women's Senior 1500 m at the Irish National Track and Field Championships on 30 July, she (running in the colours of Ballymore-Cobh) was runner up in a time of 4.12.00, behind Sarah Healy (University College Dublin).
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Sophie O'Sullivan
Sophie O'Sullivan (born 2001) is an Australian-born Irish athlete. She won a silver medal in the 800 metres at the 2018 European Athletics U18 Championships in Győr, Hungary. O'Sullivan won 1500 metres gold at the 2023 European Athletics U23 Championships in Espoo, Finland. She represented the Washington Huskies at the University of Washington in NCAA track and field competitions. In 2025, she won the NCCA outdoor 1500 m championships in Eugene, Oregon in her final race as a Washington Husky.
Sophie is the daughter of Irish World champion and Olympic Silver medallist Sonia O'Sullivan, and Australian track and field coach Nic Bideau. She has one sister, Ciara.
At the University of Washington Preview Meet on 14 January at the Dempsey Arena in Seattle, O'Sullivan achieved personal bests over the mile (4.36.67, for 6th in her section, and sixth fastest time overall) and the 800 metres (2.05.87, for 1st in her section and 5th overall). She also ran a leg of the 4 X 400 metres relay, where UW finished 4th of 15 teams in 3.56.4. At the University of Washington Invitational Meet on 28 January she ran 3000 m in 9.03.91, to finish second behind Emily Venters of Utah. O'Sullivan's time was 6th fastest in UW history. She also ran the anchor leg in the 4 by 400 relay, where her team finished 2nd in 3.45.21, behind San Diego State.
On 3 February, as part of the University of Washington distance medley relay team, alongside Marlena Preigh, Carley Thomas, and Anna Gibson, she helped the Huskies to victory in the 2023 Bruce Lehane and Scarlet White Women's 4000 m distance medley relay at Boston University Track and Tennis Center, with a 1200 m time of 3.16.24. UW's time of 10:46.62 was a new NCCA record. At the same meet, she finished 8th in the mile race in 4.39.35. At the Huskey Classic in the Dempsey Arena on 11 February O'Sullivan took the lead in the top heat of the women's mile with 200-meters to go and held on to win, lowering her mile PR to 4:33.24, and tying for the No. 5 time in school history. Shortly afterwards, she finished 19th fastest over 800 metres in 2.08.94.
At the Stanford Invitational in Pao Alto, California, on 1 April, O'Sullivan finished 2nd overall in the 1500 metres in 4.17.46. She followed this up on 22 April, again in Pao Alto, CA, as she ran 1500 metres in a 4 X 1500 metres relay in which Washington placed third in 17.15.64. At the Penn Relays on 29 April she helped UW to two top-three finishes, splitting 4:18 as the 4 × 1500 m relay took third, and splitting 2:07 to help the 4 × 800 m relay place second.
On 28 May at the NCAA Preliminaries in Sacramento, CA, O'Sullivan won her 1500 heat in a new PB of 4.08.06 to qualify for the NCCA finals in Austin, Texas on 7–10 June. Her time was the fastest over the distance in University of Washington history, eighth on the Irish all-time list, and 11th on the NCCA all-time list. On 8 June O'Sullivan was fastest qualifier in the 1500 m heats at the NCCA finals in Austin, Texas, running 4:09.58. She was unable to maintain this form in the final on 10 June, finishing 12th in 4.22.81. The race was won by Harvard's Maia Ramsden in 4.08.60.
At the Irish national under 23 Championships in Tullamore, Co. Offaly on 2 July, O'Sullivan scored a double, striking gold at both 800 m (2.10.04) and 1500 m (4.27.02). On 22 June 2023, she won the Division 3 1500m in 4.27.96 to help Ireland win promotion at the European Athletics Team Championships Third Division in Kraków.
On 16 July, O'Sullivan won the 1500 m at the European Under 23 Championships in Espoo, Finland. Her winning time was a new personal best of 4.07.18. She finished ahead of Ireland's Sarah Healy (4:07.36) and Britain's Shannon Flockhart (4:08.37). In the Women's Senior 1500 m at the Irish National Track and Field Championships on 30 July, she (running in the colours of Ballymore-Cobh) was runner up in a time of 4.12.00, behind Sarah Healy (University College Dublin).