Terence Marne O'Neill, Baron O'Neill of the Maine, PC (NI), was the fourth Prime Minister of Northern Ireland and leader (1963–1969) of the Ulster Unionist Party (UUP). A moderate unionist who sought to reconcile sectarian divisions in Northern Ireland society and met with his counterpart in the Irish Republic, he was a member of the Parliament of Northern Ireland for the Bannside constituency from 1946 until his resignation in January 1970.
- Occupation
- politician, civil servant, military personnel
- Position held
- Prime Minister of Northern Ireland, member of the House of Lords, Member of the Parliament of Northern Ireland, substitute member of the Parliamentary Assembly of the Council of Europe
- Citizenship
- United Kingdom, Ireland
