Biography
Mark O'Brien may refer to:
- Mark O'Brien (footballer born 1984), Irish footballer, plays for Shelbourne F.C.
- Mark O'Brien (footballer born 1992), Irish footballer, plays for Derby County F.C.
- Mark O'Brien (Ontario politician), Canadian politician, Green Party candidate
- Mark O'Brien (cyclist)
Write to Mark O'Brien at FanPal • 2024