Natalia Bukowiecka (née Kaczmarek, born 17 January 1998)[3] is a Polish sprinter who specialises in the 400 metres.

In May, she took two gold medals at the European Team Championships, whose Super League events took place in Chorzów, Poland.

Kaczmarek won two medals at the delayed Tokyo Olympics in 2021, a gold with Poland's mixed 4x400 relay team (alongside Karol Zalewski, Justyna Święty-Ersetic and Kajetan Duszyński), and a silver as a member of women's 4×400m relay with Iga Baumgart-Witan, Małgorzata Hołub-Kowalik and Święty-Ersetic.

In May 2022, she won 400m race at the Golden Spike meet in Ostrava, smashing her previous personal best with a time of 50.16 seconds, the second-fastest mark on the Polish all-time list.

[8] On 23 August 2023, she competed in the Women's 400 metres event at the 2023 World Athletics Championships achieving 49.57 seconds and winning the silver medal.