Catholicism primarily designates the faith, doctrine, practice and system of the Catholic Church. It may also refer to:

Catholicity, the core set of beliefs of various Christian denominations

Christian denominations and movements including:

Anglo-Catholicism, a religious movement of the Anglican Communion

Affirming Catholicism, a religious movement within the Anglican Communion

Black Catholicism, the expression of the Catholic Church among African Americans

Eastern Catholicism, Eastern rite particular churches of the Catholic Church, in full communion with the Pope in Rome

Greek Catholicism, Eastern Catholic Churches that follow the Byzantine Rite (a.k.a. Greek Rite)

Syriac Catholicism, Eastern Catholic Churches that follow the Syriac Rite

Folk Catholicism, a religious and social movement within the Catholic Church

Independent Catholicism, an independent sacramental movement originally from the Catholic Church

Old Catholicism, Western churches which separated from the see of Rome after the First Vatican council of 1869–70

Liberal Catholicism, the liberal branch within the Catholic Church

National Catholicism, a nationalist branch within the Catholic Church in Francoist Spain

Political Catholicism, the political and social doctrines of the Catholic Church

Traditionalist Catholicism, a conservative religious movement within Catholicism

Western Catholicism or Latin Catholicism