Arca - Assi
- Arca
- Arcachon, Our Lady of
- Arcadelt, Jacob
- Arcadiopolis
- Arcae
- Arcanum
- Arch
- Archaeology
- Archaeology of the Cross and Crucifix
- Archange de Lyon
- Archbishop
- Archconfraternity
- Archconfraternity of Holy Agony
- Archconfraternity of the Holy Family
- Archconfraternity of the Most Precious Blood
- Archdeacon
- Archdeacon, Richard
- Archdiocese
- Archdiocese of Aix
- Archdiocese of Albi (Albia)
- Archdiocese of Baltimore
- Archdiocese of Belem Do Para
- Archdiocese of Benevento
- Archdiocese of Bordeaux
- Archdiocese of Boston
- Archdiocese of Braga
- Archdiocese of Brisbane
- Archdiocese of Cagliari
- Archdiocese of Cambrai
- Archdiocese of Chicago
- Archdiocese of Dublin
- Archdiocese of Fermo
- Archdiocese of Goa
- Archdiocese of Gran
- Archdiocese of Halifax
- Archdiocese of Lanciano and Ortona
- Archdiocese of Manfredonia
- Archdiocese of Manila
- Archdiocese of Mechline
- Archdiocese of Messina