O’Riordan is a surname of Irish origin. Famous people with this surname include:

• Aodhán Ó Ríordáin (born 1976), Irish politician
• Brendan O'Riordan, Irish football player
• Brian O'Riordan (born 1981), Irish rugby player
• Cait O'Riordan (born 1965), British rock musician
• Conal Holmes O'Connell O'Riordan (1874–1948), Irish dramatist and novelist
• Dolores O'Riordan (1971–2018), Irish singer and songwriter
• Don O'Riordan (born 1957), Irish football player and coach
• Eugene O'Riordan, Irish author and professor of mathematics
• Jerry O'Riordan (fl. mid-20th century), Irish hurler
• Julius O'Riordan (born 1966), British DJ
• Mark O'Riordan (born 1980), Irish hurler
• Michael O'Riordan (1917–2006), Irish communist; founder of the Communist Party of Ireland
• Mossy O'Riordan (fl. mid-20th century), Irish hurler
• Rachel O'Riordan (born 1971/1972), Irish theatre director
• Robert O'Riordan (born 1943), Canadian author
• Seán Ó Ríordáin (1917–1977), Irish poet

• Riordan, a surname

This page lists people with the surname O'Riordan.
If an internal link intending to refer to a specific person led you to this page, you may wish to change that link by adding the person's given name(s) to the link.