Adam Woronowicz as Father Maksymilian Kolbe

Artur Barciś as

Paweł Deląg as Priest Włodzimierz Jakowski

Arkadiusz Janiczek as Brother Stanisław

Ksawery Szlenkier as Brother Bruno

Grzegorz Miśtal as Brother Anzelm

Michał Chorosiński as Auschwitz Prisoner

Tadeusz Chudecki as Bishop

Dominika Figurska as Marianna Kolbe

Marcin Kwaśny as Physician

Maciej Musiał as Young Franciscan

Sławomir Orzechowski as

Antoni Pawlicki as SS-Man

Mateusz Pawłowski as Rajmund Kolbe (child)

Cezary Pazura as Władysław Zenon Żebrowski

Dominik Mironiuk as Young Franciscan Peeling Potatoes (uncredited)

Maciej Gudowski as Lector (voice)