title: Mark O'Brien
text: # Mark O'Brien
  
  Mark O'Brien may refer to:
  
  * Mark O'Brien (actor) (born 1984), Canadian actor
  * Mark O'Brien (cyclist) (born 1987), Australian cyclist
  * Mark O'Brien (footballer, born 1984), Irish footballer, plays for Shelbourne F.C.
  * Mark O'Brien (footballer, born 1992), Irish footballer
  * Mark O'Brien (poet) (1949–1999), American poet and advocate for the disabled
  * Mark O'Brien (hurler), Irish hurler
  