St. Francis Xavier Cabrini

Canonization (or canonisation) is the act by which a particular Christian church or group declares a deceased person to be a saint and is included in the canon, or list, of recognized saints. Originally, individuals were recognized as saints without any formal process.

In the Catholic Church (both the Western and Eastern Churches) the act of canonization is reserved to the Holy See and occurs at the conclusion of a long process requiring extensive proof that the person proposed for canonization lived and died in such an exemplary and holy way that he or she is worthy to be recognized as a saint. The Church's official recognition of sanctity implies that the persons are now in heavenly glory, that they may be publicly invoked and mentioned officially in the liturgy of the Church, most especially in the Litany of the Saints. Other Christian churches still follow the older practice (see, for instance, below on Eastern Orthodox practice).

Canonization, whether formal or informal, does not make someone a saint: it is only a declaration that the person is a saint and was a saint even before canonization.

In the Catholic Church, canonization involves a decree that allows veneration of the saint in the liturgy of the Roman Rite throughout the world. For permission to venerate on a local level, only beatification is needed, not canonization."Beatification, in the present discipline, differs from canonization in this: that the former implies (1) a locally restricted, not a universal, permission to venerate, which is (2) a mere permission, and no precept; while canonization implies a universal precept" (Beccari, Camillo. "Beatification and Canonization" The Catholic Encyclopedia. Vol. 2. New York: Robert Appleton Company, 1907. Retrieved 27 May 2009).