Pierce Edmond O'Brien-Butler (12 January 1877 – 15 January 1902) was an Irish rugby union international player.
Pierce was a member of a titled family, the Barons Dunboyne.
His own branch of the family originated in County Tipperary, where they lived at Bansha Castle in the 18th century.
His nephew was the cricketer Paget O'Brien-Butler.
This biographical article relating to Irish Rugby Union is a stub.