Ludlow Tonson, 3rd Baron Riversdale (6 March 1784 – 13 December 1861), was a Church of Ireland bishop.

Tonson was the eighth and youngest of William Tonson, 1st Baron Riversdale, by Rose Bernard, daughter of James Bernard and sister of the 1st Earl of Bandon.William Courthope (ed.), Debrett's Complete Peerage of the United Kingdom and Ireland. Twenty-Second edition. London, 1838. He was Bishop of Killaloe, Kilfenora, Clonfert and Kilmacduagh between 1839 and 1861.Handbook of British Chronology By Fryde, E. B;. Greenway, D.E;Porter, S; Roy, I: Cambridge, CUP, 1996 , 9780521563505 He was consecrated on 17 February 1839"A New History of Ireland" Moody, T.M; Martin, F.X; Byrne, F.J; Cosgrove, F:Oxford, Oxford University Press, 1976 and succeeded his brother William in the barony in 1848. He died in December 1861, aged 77, when the barony became extinct.The Times, Monday, Dec 16, 1861; pg. 6; Issue 24117; col F Ireland

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