Basil Stanlake Brooke, 1st Viscount Brookeborough, KG, CBE, MC, TD, PC (Ire) (9 June 1888 – 18 August 1973), styled Sir Basil Brooke, 5th Baronet between 1907 and 1952, was an Ulster Unionist Party (UUP) politician who became the third Prime Minister of Northern Ireland in May 1943, holding office until March 1963.