Isabelle Boffey
Isabelle Boffey is a British middle-distance runner. She was the 2025 British indoor champion in the 800 m and she competed at the 2023 World Championships.
A successful junior, Boffey won gold over 800 m at the 2016 European U18 Championships. In 2019, she won gold over both the 800 m and 4×400 m relay at the 2019 European U20 Championships. At the 2021 European U20 Championships, she won gold over 800 m. Her 800 m personal best of 1:57.43, ran indoors, ranks her in the eighth all-time for the indoor 800 m and as the second fastest Brit.
Career
2021-2024: Early career
A member of Enfield & Haringey athletics club, she was a successful junior athlete and completed a "clean sweep" of gold medals in the 800 metres at each of the three age-grade championships in European Athletics – at the 2021 European Under-23 Championships held in Tallinn, the 2019 European U20 Championships in Boras and the 2016 European U18 Championships in Tbilisi. She was also part of the England Team at the 2017 Commonwealth Youth Games in the Bahamas.She first competed for her country as a senior in the 2021 [European Athletics Indoor Championships – Women's 800 metres|women's 800 metres event] at the 2021 European Indoor Championships held in Toruń, Poland, finishing sixth. In February 2022, she won the 1000 metres at the Birmingham Indoor Grand Prix.
In February 2023, as a 22-year-old, she claimed her first national title, winning the 800 m at the British Indoor Championships. She competed at the 2023 European Athletics Indoor Championships, but did not make the final. She set a new personal best for the 800 metres in running 1:59.30 in Madrid on 22 July 2023. She competed for Great Britain at the 2023 World Athletics Championships, in Budapest, Hungary. A grade-two hamstring tear ruled her out of action for the majority of the 2024 season.
2025-present: British indoor champion
She won the women's 800 metres at the inaugural Keely Klassic in Birmingham on 15 February 2025. She won the final of the 800 metres at the 2025 British Indoor Athletics Championships, in Birmingham, having also been the quickest qualifier. She was selected for the British team for the European Indoor Championships in Apeldoorn, Netherlands. She ran a time of 2:04.28 in her qualifying heat to finish in fourth place and did not progress to the semi-finals.In May 2025 she opted to compete for Wales, having represented England as a youth athlete. She cited her Welsh mother, who was born and raised in Porthcawl as the reason for the change, with her sights set on representing Wales at the 2026 Commonwealth Games. She was selected to represent Wales for her debut Welsh vest at the 2025 Loughborough International. On 2 August, she qualified for the final of the 800 metres at the 2025 [UK Athletics Championships] in Birmingham, placing fourth overall in 2:01.68.
On 24 January 2026, Boffey ran an indoor 800 metres personal best of 2:00.14 at the New Balance Indoor Grand Prix, in Boston, Massachusetts. The following week, Boffey lowered her outright personal best by nearly two seconds to move to second on the British all-time indoors list, behind only Keely Hodgkinson, with 1:57.43 to win the 800 m at the John Thomas Terrier Classic in Boston on 30 January, ahead of American champion Roisin Willis and Kenyan Gladys Chepngetich. The time also moved Boffey into the top-ten on the all-time indoors world list.