William Harty (1781 – 30 March 1854) was an Irish physician.
Harty was born in 1781, became a scholar of Trinity College, Dublin, in 1799, proceeded B.A.
In 1805 he published ‘Dysentery and its Combinations,’ a work which shows thoroughness and scholarship, and illustrates philosophically the doctrine of the correlation of dysentery and typhus.
In 1820 he published ‘An Historic Sketch of the Contagious Fever Epidemic in Ireland in 1817–1819,’ one of the best works on the causes and circumstances of Irish typhus, with tables and reports for many parts of the country, and a comparison with the great typhus epidemic of 1741.
In 1836 he drew up a petition to the House of Lords on the Irish Church Bill, which he published in 1837, on the advice of the Bishop of Exeter, with notes and an appendix; his contention was that the Protestant reformation had failed in Ireland on account of the poverty of the people and the insufficient endowment of the church establishment.