Grzegorz Kaszak (born 24 February 1964) is a Polish prelate of the Catholic Church who was Bishop of Sosnowiec from 2009 to 2023.

[1] For six months he was chaplain in the parish of Saint Adalbert in Świnoujście-Warszów He then studied moral theology at the Pontifical University of the Holy Cross in Rome.

He received his doctorate in 1998 with a thesis entitled "Love and responsible contraception in the catechesis of John Paul II".

After a priest died from suicide in January 2017, Kaszak made no public comments and the diocese blamed mental health issues that others disputed.

[5][6] In a letter to the diocese on 23 September, Kaszak promised that the priest who hosted the event would be punished by the Church no matter what action the civil authorities take.