Roman Catholic Diocese of Portland

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Diocese of Portland Dioecesis Portlandensis
Catholic
Cathedral of the Immaculate Conception
Coat of arms
Location
Country	United States
Territory	Maine
Ecclesiastical province	Boston
Coordinates	43°41′05″N 70°16′13″W / 43.68472°N 70.27028°W / 43.68472; -70.27028
Statistics
Area	33,040 sq mi (85,600 km2)
Population - Total - Catholics	(as of 2020) 1,329,000 219,233[1] (16.5%)
Information
Denomination	Catholic
Sui iuris church	Latin Church
Rite	Roman Rite
Established	July 29, 1853
Cathedral	Cathedral of the Immaculate Conception
Current leadership
Pope	Francis
Bishop	James T. Ruggieri
Metropolitan Archbishop	Seán Patrick O'Malley
Map
Website
portlanddiocese.org

The Diocese of Portland (Latin: Dioecesis Portlandensis) is a Latin Church ecclesiastical territory, or diocese, of the Catholic Church for the entire state of Maine in the United States. It is a suffragan diocese of the metropolitan Archdiocese of Boston.

The mother church of the Diocese of Portland is the Cathedral of the Immaculate Conception in Portland. Robert Deeley was installed as bishop in 2014. On May 7, 2024, Deeley retired and James T. Ruggieri was ordained and installed as bishop.