Church Island may refer to:

• Church Island (Menai Strait), Wales
• Church Island, River Thames, England
• Church Island (Lough Gill), Ireland

• Cathain
• Cathair Mor
• Cathair na Mart
• Cathal
• Cathal Aidhne mac Ailell
• Cathalan mac Indrechtaig
• Cathal Breslin
• Cathal Brugha St
• Cathal Brugha Street
• Cathal Bui Mac Giolla Ghunna
• Cathal Bui Mac Giolla Gunna
• Cathal Cerr
• Cathal Corc
• Cathal Coughlan
• Cathal Coughlan (disambiguation)
• Cathal Cregg
• Cathal Crobderg
• Cathal Croibhdhearg Ua Conchobair
• Cathal Cu-cen-mathair
• Cathal Dunne
• Cathal Goan
• Cathal Hayden
• Cathall (ward)
• Cathal mac Aeda
• Cathal mac Aedo