The Polish National Catholic Church, one of a number of socalled Old Catholic churches worldwide, had about 50,000 members in 1989, organized in dioceses centered in Katowice, Warsaw, Kraków, and Wroc aw. The church claims to retain all genuine Roman Catholic doctrine, while rejecting mainstream Roman Catholic tenets such as the infallibility of the pope and the immaculate conception and assumption of Mary. The thrust of the Polish National Catholic Church's beliefs is a return to "original" doctrine untainted by the addition of any new belief. The church belongs to the Union of Utrecht, which include Old Catholic churches from many countries and is overseen from the Netherlands by the archbishop of Utrecht.

The Mariavite Catholic Church of Poland is a schismatic Old Catholic group excluded from the Union of Utrecht because of unorthodox beliefs. In 1989 its membership in Poland was about 25,000, divided into three dioceses administered from Plock. About thirty priests were active in 1989.

Data as of October 1992