Klaudia Kazimierska ( ; born 3 September 2001) is a Polish track and field athlete who competes as a middle-distance runner. The national record holder over 1500 metres, she won the silver medal in the 1500 m at the 2026 European Athletics Championships, also setting new Polish national records in the mile run and the 1500 metres indoors that year. She also won the 2026 Diamond League title in the 1500 meters.
Early life Kazimierska is from Włocławek, Poland. She began to compete collegiately for the Oregon Ducks in the United States, from 2022.
Career In 2017, Kazimerska won the silver medal in the 1500 metres at the European Youth Olympic Festival in Győr, Hungary, with a time of 4:23.17. The following year, she was a bronze medalist at the 2018 European Athletics U18 Championships in the 1500 metres, held at the same venue in Hungary, running a time of 4:22.90.
In June 2024, she placed third overall at the 2024 NCAA Division I Outdoor Track and Field Championships in Eugene, Oregon, running a time of 4:08.22 to finish behind winner Maia Ramsden and second place runner Kimberley May. Later that month, she won the Polish Athletics Championships 1500 metres national title with a time of 4:10.29 in Bydgoszcz. She qualified for the 1500 metres race at the 2024 Summer Olympics in Paris, France, in August 2024, with a best time in 2024 of 4:01.89. She finished in tenth place overall in the final, with a new personal best time of 4:00.12.
In October 2024, Kazimierska signed an NIL deal with Nike alongside fellow Oregon teammates Matti Erickson and Maddy Elmore.
She missed the 2025 indoor season with a hip injury, but returned to action in April 2025 at the Oregon Team Invitational held at Hayward Field, winning both the 800 metres and 1500 metres races at the meet. She qualified for the final of the 1500 metres at the 2025 NCAA Outdoor Championships in Eugene, Oregon in June 2025. She competed for Poland in the 1500 metres at the 2025 European Athletics Team Championships First Division in Madrid on 29 June 2025. In September 2025, she was a finalist over 1500 metres at the 2025 World Championships in Tokyo, Japan, placing seventh in a personal best time of 3:57.95.
On 24 January 2026, Kazimierska ran a Polish short track record of 4:01.78 at the Indoor Grand Prix, in Boston.
On 1 February 2026, Kazimierska finished third in the Wanamaker Mile at the Millrose Games in New York, with her time of 4:21.36 setting a national record for Poland. She placed sixth in the final of the 1500 m at the 2026 World Athletics Indoor Championships in Toruń, Poland. On 4 July, she ran a new Polish national record of 4:17.90 in the mile run at the 2026 Prefontaine Classic. On 16 August, she won the silver medal behind Georgia Hunter Bell in the 1500 metres at the 2026 European Athletics Championships in Birmingham. On 23 August, she ran 3:55.59, setting a new national record, in the 1500 metres in the Diamond League at the 2026 Kamila Skolimowska Memorial in Silesia, Poland.
On 5 September 2026, Kazimierska won the final Diamond League event in Brussels setting a new world lead, meet record and national record of 3:54.05. She secured the overall 2026 Diamond League title in the 1500 meters event becoming the first Polish female athlete to accomplish this. On 12 September, she finished in 3:57.55 to win the inaugural World Ultimate Championship in Budapest ahead of European champion Georgia Hunter Bell. On 18 September 2026, Kazimierska participated at the Athlos London 2026, a professional, female-only track and field meeting, winning the mile run by achieving 4:19.43 ahead of Georgia Hunter Bell.
Achievements Information from her World Athletics profile unless otherwise noted.
Personal bests TypeDistanceTime (s)VenueDateNotesIndividual eventsIndoor800 metres 2:00.02Boston, United States22 February 20261500 metres 4:01.78Boston, United States24 January 2026Mile 4:21.36New York, United States1 February 20262000 metres 5:52.26Toruń, Poland23 January 2021Outdoor800 metres1:58.11Berlin, Germany30 August 20261000 metres2:39.05Wałcz, Poland10 August 20221500 metres3:54:05Brussels, Belgium5 September 2026Mile4:17.90Eugene, United States4 July 2026Team eventsOutdoor4 × 800 metres relay8:30.12Des Moines, United States25 April 2025 International competitions 2017European Youth Olympic FestivalGyőr, Hungary2nd1500 m4:23.172018European U18 ChampionshipsGyőr, Hungary3rd1500 m4:22.90Youth Olympic GamesBuenos Aires, Argentina10th (h)1500 m4:34.222019European U20 ChampionshipsBorås, Sweden5th1500 m4:29.83European Cross Country ChampionshipsLisbon, Portugal64th4000 m U20 Race15:532021European Indoor ChampionshipsToruń, Poland19th (h)1500 m4:18.24European U23 ChampionshipsTallinn, Estonia7th1500 m4:17.472023European U23 ChampionshipsEspoo, Finland4th1500 m4:10.712024Olympic GamesParis, France10th1500 m4:00.122025European Team Championships First DivisionMadrid, Spain4th1500 m4:09.70World ChampionshipsTokyo, Japan7th1500 m3:57.952026World Indoor ChampionshipsToruń, Poland6th1500 m4:02.80European ChampionshipsBirmingham, United Kingdom2nd1500 m4:08.80World Ultimate ChampionshipBudapest, Hungary1st1500 m3:57.55
National championships and competitions 2017Polish U18 ChampionshipsWarsaw1st1500 m4:29.522018Polish ChampionshipsLublin7th1500 m4:23.44Polish U18 ChampionshipsChorzów1st1500 m4:31.652019Polish U20 Indoor ChampionshipsToruń1st3000 m 10:01.99Polish U20 ChampionshipsRacibórz1st1500 m4:25.632020Polish ChampionshipsWłocławek2nd1500 m4:18.25Polish U20 ChampionshipsRadom1st1500 m4:31.171st3000 m9:51.932021Polish Indoor ChampionshipsToruń2nd1500 m 4:24.33Polish ChampionshipsPoznań5th1500 m4:15.23Polish U23 ChampionshipsSuwałki1st800 m2:04.781st1500 m4:27.822022Polish Indoor ChampionshipsToruń7th1500 m 4:26.974th3000 m 9:14.01Polish ChampionshipsSuwałki5th1500 m4:33.80Polish U23 ChampionshipsPoznań1st800 m2:07.351st1500 m4:23.712023Polish U23 ChampionshipsWłocławek1st800 m2:06.351st1500 m4:29.482024Polish ChampionshipsBydgoszcz1st1500 m4:10.962025Polish ChampionshipsBydgoszcz1st1500 m4:21.922026Polish ChampionshipsBiałystok1st800 m1:58.971st1500 m4:06.88 References
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