O’Riordan is a surname of Irish origin.
Famous people with this surname include:
Aodhán Ó Ríordáin (born 1976), Irish politicianBrendan O'Riordan (contemporary), Irish professional football playerBrian O'Riordan (born 1981), Irish professional rugby playerCait O'Riordan (born 1965), British rock musicianConal Holmes O'Connell O'Riordan (1874–1948), Irish dramatist and novelistDolores O'Riordan (born 1971), Irish singer and songwriterDon O'Riordan (born 1957), Irish professional football player and coachEugene O'Riordan (contemporary), Irish author and professor of mathematicsGerry O'Riordan (fl. mid-20th century), Irish hurlerJulius O'Riordan (born 1966), British DJMark O'Riordan (born 1980), Irish hurlerMichael O'Riordan (1917–2006), Irish communist; founder of the Communist Party of IrelandMossy O'Riordan (fl. mid-20th century), Irish hurlerRobert O'Riordan (born 1943), Canadian authorSeán Ó Ríordáin (1917–1977), Irish language poet