Rt. Hon. William Grant (6 April 1883 – 15 August 1949) was a Unionist politician in Northern Ireland. Born at 110 Earl Street in Belfast, son of linen worker Martin Grant and Mary Ann Gibson, Grant worked as a shipwright and was a founder member of the Ulster Unionist Labour Association. He was also a founder member of the Ulster Volunteers. He was elected to the Northern Ireland House of Commons as an Ulster Unionist Party member for Belfast North in 1929, then winning Belfast Duncairn in 1929, holding this until his death.