John Leslie Foster, FRS (c. 1781 – 10 July 1842) was an Irish barrister, judge and Tory Member of Parliament (MP) in the United Kingdom Parliament. In 1830 he was appointed a Baron of the Court of Exchequer of Ireland.
He was the son of William Foster, Bishop of Clogher (1744-1797) and nephew of John Foster, 1st Baron Oriel. He was educated at Trinity College Dublin and St John's College, Cambridge.[1]