Robert Flint FRSE (1838–1910) was a Scottish theologian and philosopher who wrote also on sociology.
He was born in Applegarth in Dumfriesshire on 14 March 1838.
He was the son of Robert Flint, at that time a farm overseer, and his wife, Grace Johnston. His first school was at Moffat. In 1852, he entered Glasgow University, where he distinguished himself (without graduating) in arts and divinity.
Having been employed as a lay missionary by the 'Elders' Association' of Glasgow, he was licensed to preach in 1858, and for a short time acted as assistant to Norman Macleod (1812–1872), at the Barony Church, Glasgow. He was minister of the East Church, Aberdeen from 1859 to 1862) and of Kilconquhar church in Fife from 1862 to 1864, a small country village parish, which gave him leisure for study, improved by visits to Germany.
On the death of James Frederick Ferrier in 1864, Flint was elected to succeed him in the moral philosophy chair at St. Andrews University, among the competing candidates being Thomas Hill Green. This chair he held till 1876, when he succeeded Thomas Jackson Crawford in the divinity chair of Edinburgh University. On this appointment he was awarded doctorates by both Glasgow University (LLD) and Edinburgh University (DD). Thomas Chalmers had similarly migrated from the one chair to the other.
Flint was appointed to a number of foundation lectureships. He was Baird lecturer (1876-7); in 1880 he crossed to America, and delivered a course as Stone lecturer at Princeton; in 1887-8 he was Croall lecturer. He was elected on 21 May 1883 corresponding member of the Institute of France (Académie des sciences morales et politiques), and was elected a Fellow of the Royal Society of Edinburgh in 1880. His proposers were Sir Robert Christison, Sir Alexander Grant, Alexander Campbell Fraser and Peter Guthrie Tait He served as Vice President to the Society for three sessions: 1886-1892; 1893-1899; and 1902-1907.