Robert Lowder Seaborn (July 9, 1911 – February 15, 1993) was a Canadian minister of the Anglican faith. He was the Anglican Bishop of Newfoundland in Canada from 1965 to 1980.
Born in Toronto, Ontario he attended Normal Model School and completed high school at the University of Toronto Schools. He earned a BA in Classics in 1932 and a degree in divinity at University of Trinity College at the University of Toronto and spent 1936–37 at Oxford University. He was ordained deacon in 1934, priest in 1935 and served as assistant curate in his initial parish, St. Simon-the-Apostle Church in Toronto, followed by St. James' Cathedral Toronto from 1937 to 1941. He then became rector of St. Peter's in Cobourg, Ontario (1941–48).