William O'Sullivan (1873 – 3 March 1953) was an Irish politician and medical doctor.

He was a Cumann na nGaedheal member of Seanad Éireann from 1922 to 1936.

[3] He practised for many years in Killarney where he was Medical officer of health and county coroner for East Kerry.

[4] He died at his home, Inch House, Killarney, on 3 March 1953, aged 79.

[5] A noted sportsman himself he was the father of Billy O'Sullivan, an international Irish golfer and golf administrator.