Thomas Dawson, 1st Viscount Cremorne was an Irish landowner and politician from County Monaghan.

He represented County Monaghan in the Irish House of Commons from 1749 to 1768, and on 28 May 1770 was raised to the Irish House of Lords as Baron Dartrey, of Dawson's Grove in the County of Monaghan, being elevated to Viscount Cremorne on 19 June 1785.

[1] Lord Cremorne was married on 15 August 1754, at St Martin-in-the-Fields, to Anne Fermor (baptised 25 May 1733), youngest daughter of Thomas Fermor, 1st Earl of Pomfret and his wife, Henrietta Jeffreys, a daughter of The 2nd Baron Jeffreys.

Their only surviving child, Thomas, died aged sixteen on 9 October 1787,[2] and on 20 November 1797 Cremorne was created Baron Cremorne, of Castle Dawson in the County of Monaghan, with a special remainder, failing the heirs male of his body, to his nephew Richard Dawson and the heirs male of his body.

[1] Lord Cremorne was one of the largest landowners in Ireland, with an annual income from his estates of £8,000 in 1799.