Abbott, Sir John Joseph Caldwell, 1821–93, Canadian political leader. He was a graduate of McGill College, where he served on the law faculty (1853–80). He served in the Canadian House of Commons (1860–74; 1880–87) before his appointment to the Senate in 1887. As prime minister (1891–92), Abbott headed a Conservative administration. He is best remembered for being the first Canadian-born prime minister.