Thomas Sheridan (1719 – 14 August 1788) was an Irish stage actor, an educator, and a major proponent of the elocution movement. He received his M.A. in 1743 from Trinity College in Dublin, and was the godson of Jonathan Swift. He also published a "respelled" dictionary of the English language (1780). He was married (1747) to Frances Chamberlaine. His son was the better known Richard Brinsley Sheridan, while his daughter Alicia also wrote plays. His work is very noticeable in the writings of Hugh Blair.
Thomas Sheridan was the third son of Dr Thomas Sheridan, an Anglican divine, noted for his close friendship with Jonathan Swift, and his wife Elizabeth McFadden He attended Westminster School in 1732-1733 but, because of his father’s financial problems, he had to finish his initial education in Dublin. In 1739, he earned his BA from Trinity College, Dublin and he went on to earn his MA from Trinity in the early 1740s. He had his début in acting when he played the title role in Shakespeare’s Richard III in Dublin. Soon after, he was noted as the most popular actor in Ireland, being compared often with David Garrick. Not only an actor, he also wrote The Brave Irishman or Captain O'Blunder which premièred in 1738. He became the manager of the Dublin theatre sometime in the 1740s.
Sheridan left his acting career, although he continued to manage theatre companies and occasionally play bit parts, and moved permanently to England with his family in 1758. There, his time was spent as a teacher and an educator offering a very successful lecture course. In 1762 Sheridan published Lectures on Elocution. Following that work, he published A Plan of Education (1769), Lectures on the Art of Reading (1775), and A General Dictionary of the English Language (1780). Each of these works was based on some form of an argument taken in an earlier work British Education: Or, The source of the Disorders of Great Britain. Being an Essay towards proving, that the Immorality, Ignorance, and false Taste, which so generally prevail, are the natural and necessary Consequences of the present to defective System of Education. With an attempt to shew, that a revival of the Art of Speaking, and the Study of Our Own Language, might contribute, in a great measure, to the Cure of those Evils (1756).