Colonsay, an island of the Inner Hebrides, Argyllshire, Scotland, 10 m. S. of the Ross of Mull. It is 7½ m. long by 3 m. broad. The highest point is Carnan Eoin (470 ft.). Towards the middle of the island lies Loch Fada, nearly 2 m. long but very narrow, and there are two other small lakes and a few streams. The coast-line, with frequent beautiful sandy reaches, is much indented, the chief bays being Kiloran, Kilchattan and Staosunaig. On the north-western coast the cliffs are particularly fine. To the south, separated by a strait that is fordable at low water, lies the isle of Oronsay, 2¼ m. long by 2¾ m. wide. Both islands contain a number of ecclesiastical remains, standing stones, and some beautiful sculptured crosses. They are named after Columba and Oran, who are said to have stopped here after they left Ireland. There is regular communication between Scalasaig and Glasgow and the Clyde ports. The golf-course at Kilchattan lends a touch of modernity to these remote islands. Near Scalasaig a granite obelisk has been erected to the memory of Sir Duncan M‘Neill (1794-1874), a distinguished Scottish lawyer, who took the title of Lord Colonsay when he became a lord of appeal. The soil of both islands is fertile, potatoes and barley being raised and cattle pastured. Population: Colonsay (1901), 301; Oronsay (1901), 12.