Dave, Davey or David O'Brien may refer to:
Sportsmen Davey O'Brien (1917–1977), American football quarterback Dave O'Brien (athletic director) (1956–2014), American collegiate professor at Long Beach, Temple and Northeastern David O'Brien (racehorse trainer), Irish racehorse trainer during 1970s and 1980s Dave O'Brien (sportscaster) (born 1963), American sportscaster David O'Brien (sailor) (born 1965), Irish yacht racer in 2000 Summer Olympics David O'Brien (swimmer) (born 1983), English freestyle in 2004 Summer Olympics David O'Brien (footballer) (born 1984), Scottish left-sided midfielder Dave O'Brien (American football) (born 1941), American football player
Others Dave O'Brien (actor) (1912–1969), American film and TV performer, director and writer David Wright O'Brien (1918–1944), American fantasy and science fiction writer David O'Brien (actor) (1937–1989), American performer in daytime dramas David P. O'Brien (born 1941), Canadian business executive since 1980s David O'Brien (politician) (born 1970), Australian politician from Victoria
David O'Brien (Politician)