Sir John Stewart, 1st Baronet (c.1758 – 22 June 1825) was an Irish lawyer and politician. He was a son of Church of Ireland clergyman, the Reverend Hugh Stewart, Rector of Termonmaguirk, County Tyrone and Sarah Hamilton, daughter of the Venerable Andrew Hamilton, who was Archdeacon of Raphoe for more than sixty years. He was educated in Drogheda and at Trinity College Dublin, studied law at Lincoln's Inn, and was called to the Irish Bar in 1781. Stewart married in 1789, Mary, daughter of Mervyn Archdale of Castle Archdale, near Enniskillen, with whom he had two sons and a daughter.