In the 2020–21 season, Piast Gliwice competed in Ekstraklasa and this season's edition of the Polish Cup.

[1][2] They competed in the UEFA Europa League qualifying phase, but were eliminated in the third qualifying round, following the 3–0 defeat to Copenhagen.

[3] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Players may hold more than one non-FIFA nationality.