James Rolston Lonsdale (31 May 1865 – 23 May 1921) was Unionist Member of Parliament (MP) for Mid Armagh from January 1918 until his death.Who's Who of British Members of Parliament: Volume III 1919-1945, edited by M. Stenton and S. Lees (The Harvester Press 1979) He succeeded his brother John to this constituency on the latter's elevation to the Lords as Baron Armaghdale.

The son of James Lonsdale, DL, he was educated at The Royal School, Armagh and Trinity College, Dublin. In 1902 he married Maud Musker, daughter of John Musker of Shadwell Court, Norfolk.

He was appointed High Sheriff of Armagh in 1891.Walford, Edward (1909). The County Families of the United Kingdom. London: Spottiswoode & Co. Ltd. There is a memorial to Lonsdale in the south aisle at St Patrick's Cathedral, Armagh.

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