Kacper Kostorz is a Polish professional footballer who started his career with Podbeskidzie Bielsko-Biała before moving from Legia Warsaw to Pogoń Szczecin on 7 January 2022. He was loaned to Korona Kielce on 17 February 2023 and later joined Eerste Divisie side Den Bosch on a season-long loan on 11 July 2023.
During the 2023–24 season, he scored 16 goals in 38 appearances for Den Bosch and was named the club's Player of the Year. On 9 July 2024, Kostorz moved on loan to Eredivisie club NAC Breda, and he terminated his contract with Pogoń by mutual consent on 15 January 2026.
Korona Kielce owner Łukasz Maciejczyk allegedly expressed anger and suggested substituting captain Mariusz Stepiński during a Polish Cup loss to Polonia Warsaw.
Korona Kielce owner Łukasz Maciejczyk allegedly expressed anger and suggested substituting captain Mariusz Stepiński during a Polish Cup loss to Polonia Warsaw.
