Alfred Richard Cecil Selwyn, CMG, LL.D, FRS, FGS (26 July 1824 – 19 October 1902) was a British geologist and public servant, director of the Geological Survey of Victoria from 1852–1869, director of Geological Survey of Canada 1869–1894 and President of the Royal Society of Canada 1895-1896.
Selwyn was born in Kilmington, Somerset (now in Wiltshire), England, the son of the Rev. Townshend Selwyn (Canon of Gloucester Cathedral) and his wife, Charlotte Sophia, daughter of Lord George Murray, bishop of St David's, Wales, and granddaughter of the fourth Duke of Athol.
Educated by private tutors at home and afterwards in Switzerland, Selwyn there became interested in geology, and in 1845 he joined the staff of the Geological Survey of Great Britain under Sir Henry De la Beche and Sir A. C. Ramsay. Selwyn was actively engaged in the survey of North Wales and bordering portions of Shropshire, and a series of splendid geological maps resulted from his joint work with Ramsay and J. B. Jukes, earning a great commendation from Ramsay. Selwyn was promoted to geologist on 1 January 1848.