The Diocese of Gliwice () is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Poland. Its episcopal see is located in the city of Gliwice. The Diocese of Gliwice is a suffragan diocese in the ecclesiastical province of the Archdiocese of Katowice. , about 89% of the population in the territory of the diocese is self-described Catholic, however only 39% are practising Catholics.