Danny O'Brien may refer to:
Danny O'Brien (Australian rules footballer) (born 1980), former Australian rules footballer Danny O'Brien (boxer) (1939–2001), Irish Olympic boxer Danny O'Brien (gridiron football) (born 1990), American football quarterback Danny O'Brien (journalist) (born 1969), British technology journalist and civil liberties activist Danny O'Brien (politician) (born 1974), Australian politician and Member of the Victorian Legislative Assembly Danny O'Brien, character in The Affairs of Martha Danny O'Brien (footballer, born 1996), English footballer for Finnish side SJK Danny O'Brien (racing driver) (born 1967), 14 time track champion of Brockville Ontario Speedway
See also Daniel O'Brien (disambiguation)