Daniel or Dan O'Brien may refer to:
Politicians and nobles
- Daniel O'Brien, 1st Viscount Clare (1577–1663), MP for County Clare, younger son of Connor O'Brien, 3rd Earl of Thomond
- Daniel O'Brien, 3rd Viscount Clare (fl. 1670–1691), son of Connor O'Brien, 2nd Viscount Clare
- Daniel O'Brien, 4th Viscount Clare (died 1693), son of Daniel O'Brien, 3rd Viscount Clare
- Daniel O'Brien (Jacobite) (1683–1759), Irish Jacobite soldier and diplomat
- Daniel Pitt O'Brien (1900–1957), Secretary of State of West Virginia
Sportspeople
Athletes
- Dan O'Brien (born 1966), American decathlete
- Dan O'Brien (footballer) (1884–1917), Australian rules football player
- Dan O'Brien (pitcher) (born 1954), American baseball player
- Dan O'Brien (soccer) (born 1986), American soccer player
- Danny O'Brien (gridiron football) (born 1990), American college football quarterback
Coaches / executives
- Dan O'Brien (American football) (born 1963), American college football coach and administrator
- Dan O'Brien (baseball coach) (born 1971), American college baseball coach
- Dan O'Brien Sr. (1929–2017), American baseball executive, general manager of Rangers, Mariners, Angels
- Dan O'Brien (baseball executive) (born 1953 or 1954), American former baseball executive, general manager of Reds; son of Dan O'Brien Sr.
Writers / journalists
- Daniel O'Brien (comedian) (born 1986), American humorist, writer and comedian
- Dan O'Brien (author) (born 1947), American author and rancher
- Dan O'Brien (playwright) (born 1974), American playwright
- Dan O'Brien (sports journalist), American sports journalist, author and screenwriter
- Danny O'Brien (journalist) (born 1969), British technology journalist
See also
- Danny O'Brien (disambiguation)
- Danielle O'Brien (born 1990), Australian ice dancer
Topics referred to by the same termThis disambiguation page lists articles about people with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article.