Michael Tierney may refer to: Michael Tierney (bishop) (1839–1908), Roman Catholic bishop Michael Tierney (politician) (1894–1975), Irish politician, president of University College Dublin Michael Tierney (musician) (born 1977), member of Australian band Human Nature Michael Tierney (Gaelic footballer) (born 1986), Gaelic football player from Laois in Ireland Michael Tierney (film director), American film director, actor, and screenwriter Mick Pyro, Irish musician