The Privy Council of Northern Ireland is a formal body of advisors to the sovereign and was a vehicle for the monarch's prerogative powers in Northern Ireland. It was modelled on the Privy Council of Ireland.
The Privy Council of Northern Ireland consisted of senior members of the Government of Northern Ireland, including the Prime Minister of Northern Ireland; its members were appointed for life. The Council usually met at Hillsborough Castle, and meetings would be attended by the Governor of Northern Ireland and several Privy Counsellors. The Governor-in-Council performed a range of functions, from summoning, proroguing, and dissolving the Parliament of Northern Ireland to making statutory rules in accordance with various Acts of Parliament. However, the Council's proceedings were purely formal, with no debate or discussion.
Members are entitled to use the prefix The Right Honourable, whilst peers who are members use the post-nominal letters PC (NI). Two members are still living as of May 2022: Lord Kilclooney (appointed 1970) and Robin Bailie (appointed 1971).