Bartosz Mazurek (born 3 January 2007) is a Polish professional footballer who plays as a midfielder for Ekstraklasa club Jagiellonia Biaà Âystok.
Born in Grajewo, Mazurek began playing as a youth for Warmia Grajewo. Aged 12 and playing with boys older than him, he was signed by Jagiellonia Biaà Âystok after impressing in a match against them.
In January 2026, Jagiellonia sold 17-year-old Oskar Pietuszewski to Porto for â¬10 million, opening a space for Mazurek. On 31 January, Mazurek scored his first goal in a 3âÂÂ1 win away to Widzew à Âódà º. On 26 February, he scored a hat-trick in a 4âÂÂ2 extra-time win away to Fiorentina in the UEFA Conference League knockout phase playoffs; the Italian club won 5âÂÂ4 on aggregate. Italian national sports newspaper La Gazzetta dello Sport rated his performance 8 out of 10 and compared him to Cristiano Ronaldo. He was the 10th player and first Pole to score three goals in a Conference League match, and at 19 years and 1 month he surpassed 22-year-old Marek Filipczak as the youngest Pole to score three goals in a European match.