Fordyce, David brother of James, was born in 1711 at Aberdeen. In 1742 he was appointed professor of moral philosophy in Marischal College. He perished by shipwreck in 1751. He wrote Dialogues concerning Education: — Theodorus, a Dialogue on the Art of Preaching (Lond. 1755,. 3d ed. 12mo): — Elements of Moral Philosophy (Lond. 1769, 4th ed. 12mo).