Klaudia Kazimierska

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.

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 2026 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.