Mary O'Brien

Mary O'Brien may refer to:

Mary Ann O'Brien, Irish politician
Mary Eileen O'Brien, American academic administrator
Mary F. O'Brien, United States Air Force general
Mary Grace O'Brien, judge of the Virginia Court of Appeals
Dusty Springfield, British pop singer
Mary K. O'Brien, American politician and judge
Mary O'Brien, 3rd Countess of Orkney, mute Irish countess
Mary O'Brien, 4th Countess of Orkney, Scottish peeress
Mary O'Brien (philosopher), feminist political philosopher
Mary O'Brien (writer), Irish poet and playwright
Mary O'Brien Harris, British politician