Connor O'Brien may refer to:

Connor O'Brien, King of Thomond (died 1540) Connor O'Brien, 3rd Earl of Thomond (1534?–1581) Connor O'Brien, 2nd Viscount Clare (1605–1670) Connor O'Brien (alpine skier) (born 1961), Canadian alpine skier Connor O'Brien (footballer) (born 2004), English footballer

See also Con O'Brien (disambiguation) Conor O'Brien (disambiguation) Conor O'Brian (born 1980), American wrestler