Hugh Duff (1870 or 1871–1940) was a unionist politician in Northern Ireland.
Duff was the director of a linen manufacturing company. He joined the Ulster Unionist Party and was elected to the Senate of Northern Ireland in 1937,John F. Harbinson, The Ulster Unionist Party, 1882-1973, p.206 serving until his death in 1940.Members of the Northern Ireland Senate, 1921-72, Northern Ireland Elections
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