Jan Ziolkowski is a Polish centre-back born in Warsaw in 2005. He played youth football with Wicher Kobylka and Polonia Warsaw before joining Legia Warsaw in 2022. After time with Legia's reserves, he made his first-team debut in May 2024, extended his contract and scored his first senior goal in a Polish Cup match in 2025. Roma signed him in August 2025, and he soon appeared in European competition. Ziolkowski made his senior Poland debut in October 2025 in a friendly against New Zealand.