John Clements Glendinning (1866 – 1949) was a unionist politician in Northern Ireland.

Glendinning was a newspaper proprietor and served in various public posts for the Ulster Unionist Party.John F. Harbinson, The Ulster Unionist Party, 1882-1973, p.206 He was elected to the Senate of Northern Ireland in 1922, serving until 1933. He was re-elected to the Senate the following year, and served until 1946.The Northern Ireland Senate, 1921-72 , Northern Ireland Elections

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