Cathal O'Conor was king of Connacht from 1280 to 1288.

Cathal O'Connor or Cathal O'Conor may also refer to:

• Cathal mac Conchobar mac Taidg, king of Connacht, died 1010
• Cathal Carragh Ua Conchobair, king of Connacht from 1189 to 1202
• Cathal Crobhdearg Ua Conchobair, 12th/13th-century king of Connacht

• Cathal Ó Conchobair, 14th-century Irish bishop
• Cathal O'Connor (died 1596), 16th-century Irish rebel, known as Don Carlos

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