List of Roman Catholic dioceses in Canada

The Catholic Church in Canada comprises eighteen ecclesiastical provinces each headed by an archbishop. The provinces in turn comprise 18 archdioceses and 52 dioceses, each headed by an archbishop or a bishop.

The following particular churches are not suffragan to Metropolitan sees, but are instead immediately subject to the Holy See:

The province geographically consists of the majority of Alberta, except for the province's northwestern corner.

The province geographically consists of the western third of Quebec.

The province geographically consists of the entirety of Yukon Territory and the Northwest Territories, plus the northwestern corner of Alberta, the western third of Nunavut, and a tiny portion of northern Saskatchewan.

The province is geographically conterminous with the provinces of Nova Scotia and Prince Edward Island.

The province geographically consists of the northern half of Manitoba, the northern third of Saskatchewan, the eastern two-thirds of Nunavut, and a portion of northwestern Ontario.

The province geographically consists of central and parts of eastern Ontario.

The province is geographically coterminous with the province of New Brunswick.

The province geographically consists of south-central portions of Quebec.

The province geographically consists of northeastern and parts of eastern Ontario.

The province geographically consists of north-central portions of Quebec.

The province geographically consists of the southern two-thirds of Saskatchewan.

The province geographically consists of northeastern portions of Quebec.

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