Conor O'Brien

• Conor O'Brien (died 1603), Irish nobleman and landowner
• Conor O'Brien (died 1651), Royalist Commander during the Irish Confederate Wars
• Edward Conor Marshall O'Brien, Irish aristocrat, republican, nationalist, sailor
• Conor Cruise O'Brien, Irish writer, politician, and diplomat
• Conor O'Brien, 18th Baron Inchiquin, Irish peer
• Conor O'Brien (hurler), Tipperary intercounty player
• Conor O'Brien (soccer), American soccer player
• Conor O'Brien (rugby union), Irish rugby union player
• Conor O'Brien, Irish musician and member of Villagers