Danny O'Brien

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 Council
 * 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