Thomas Gawne, First Deemster of the Isle of Man in the early nineteenth century.

He presided over one of the set-piece trials of the period. James McCrone was prosecuted for perjury on an information preferred by Robert Cunninghame, Resident Attorney-General of the Isle of Man, before the Honourable Thomas Gawne as His Majesty's First Deemster. The trial opened on Thursday 7 September 1820 and ran by adjournment to the evening of Saturday the 9th, and McCrone was honourably acquitted. A full report was printed, with copies of the records of the several proceedings and of the evidence.

The Home Office papers catch him on more ordinary business. In October 1818 the Lieutenant-Governor forwarded to Lord Sidmouth an application from Deemster Gawne to be paid for extra work, and Gawne wrote on his own behalf on the 28th of that month to the same effect. In August 1830 John Quayle of Peel, who had been a Coroner for many years, petitioned with a complaint about the behaviour of Thomas Gawne and George Dumbell in court on 15 July that year, in a dispute over the value of land involving a Mrs Kelly and John Taggart.

He served in the Island's forces as well. A Thomas Gawne, Esquire, is the captain at the head of the officers of the Manx Yeomanry Cavalry raised in 1796.