William Barclay (1873 or 1874–1945) was a unionist politician in Northern Ireland.
Barclay worked as a shipyard joiner and was elected to the Senate of Northern Ireland as an Ulster Unionist Party member in 1925, despite having no political experience.John F. Harbinson, The Ulster Unionist Party, 1882-1973, p.205 He served until his death in 1945.Members of the Northern Ireland Senate, 1921-1972, Northern Ireland Elections
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