Thomas Macgregor Greer (31 January 1853 – 19 February 1928) was a unionist politician in Northern Ireland.

McGreer studied at Trinity College, Dublin, before becoming a solicitor."Obituaries.", The Times, 22 February 1928, p.19 He was elected to the first Senate of Northern Ireland as an Ulster Unionist Party member, despite having no political experience, and served for six-and-a-half years.John F. Harbinson, The Ulster Unionist Party, 1882–1973, p.204

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