William O'Callaghan was an Irish Fine Gael politician. He was the ninth child born to Catherine and Cornelius O'Callaghan, farmers in Scarragh, Lombardstown, County Cork. He married Anna Sheahan and together they had four children. He bought Longueville House, Mallow in 1938.
- Occupation
- politician, farmer
- Position held
- senator of Ireland, senator of Ireland, senator of Ireland, senator of Ireland
- Citizenship
- Ireland
- Born
- 1881
- Died
- January 28, 1967