Sir Robert John Rolston Harcourt, JP (1902 – 25 August 1969) was a Northern Irish unionist politician.
He was High Sheriff of Belfast in 1949, and later in the year unsuccessfully stood as the Ulster Unionist Party (UUP) candidate for South Down.
Soon after this, John William Nixon, the independent Unionist MP for Belfast Woodvale, died.
Harcourt stood in the ensuing by-election on 4 April 1950 and was elected.
[1] In 1955, Harcourt was elected Lord Mayor of Belfast, a position which carried with it an ex officio position in the Senate of Northern Ireland.