Thomas Elrington (18 December 1760 – 12 July 1835) was an Irish academic and bishop who served as the 25th Provost of Trinity College Dublin from 1811 to 1820.

In 1795, he was appointed Archbishop King's Lecturer in Divinity, succeeded to a senior fellowship, and also became the third Erasmus Smith's Professor of Mathematics (1795–1799).

[5] In 1789, he published the mathematical treatise Euclidis Elementorum Sex Libri Priores, Cum Notis (Dublin University Press), whose 10th edition appeared in 1833.

On resigning his fellowship in 1806, Elrinton was presented by his college to the rectory of Ardtrea, in the diocese of Armagh, which he held until December 1811.

[5] A portrait of the bishop was painted in 1820 for his brother, Major Elrington, by Thomas Foster; engraved by William Ward, it was published in 1836 by Graves & Co.

His works are:[5] Elrington also published sermons and charges, and edited, for the use of Trinity College, 'Euclid's Elements, the first Six Books,' 1788 (ten or twelve times reprinted); 'Locke on Government, with Notes,' 1798; and 'Juvenalis et Persius, edito expurgata,' 1808.

Plunket Preston, rector of Duntryleague, County Limerick, and by her had issue Charles Richard Elrington, another son Henry, and several daughters, including Caroline (died 1868), who married, in 1827, John Whitley Stokes (1801-1883), Archdeacon of Armagh, and had a son Thomas Gabriel Stokes.