Sandie Lindsay, 1st Baron Lindsay of Birker

Alexander Dunlop Lindsay, 1st Baron Lindsay of Birker CBE (born 14 May 1879 in Glasgow, Scotland; died 18 March 1952), known as Sandie Lindsay, was a Scottish academic and peer.

The son of Thomas Martin Lindsay (1845–1914) by his marriage to Anna Dunlop (1845–1903), Lindsay was educated from 1887 at the Glasgow Academy, then at the University of Glasgow, where he gained a Master of Arts degree in 1899, and lastly at University College, Oxford, where he took a Double First in 1902.

In 1903 he won the Shaw fellowship in moral philosophy at Edinburgh University, as had his father, the first recipient of this award. He was assistant lecturer in philosophy at the Victoria University of Manchester from 1904–1906, when he was elected a fellow and tutor in philosophy at Balliol College, Oxford.

During the First World War he served in France, was mentioned twice in dispatches, and was a Lieutenant-colonel.

He was Professor of Moral Philosophy at the University of Glasgow (1922–24). He was president of the Aristotelian Society from 1924 to 1925. In 1924 he became master of Balliol College and became Vice-Chancellor of the University of Oxford from 1935–38. He worked with Lord Nuffield who donated £1m to fund a new physical chemistry laboratory and a postgraduate college for social studies, Nuffield College, Oxford in 1937.

At Oxford, Lindsay was a leading figure in the adult education movement. On his retirement from Balliol, in 1949, Lindsay was appointed the first Principal of the University College of North Staffordshire which opened in 1949 and is now Keele University.

In 1938, Lindsay stood for Parliament in the Oxford by-election as an 'Independent Progressive' on the single issue of opposition to the Munich Agreement, with support from the Labour and Liberal parties as well as from many Conservatives including the future Prime Ministers Winston Churchill, Harold Macmillan and Edward Heath, but lost to the official Conservative candidate, Quintin Hogg.

Lindsay married Erica Violet Storr (1877 - 28 May 1962), daughter of Francis Storr, in 1907 and they had two sons and one daughter.

He was elevated to the peerage on 13 November 1945 as Baron Lindsay of Birker, of Low Ground in the County of Cumberland. He was succeeded in the barony by his eldest son Michael Francis Morris Lindsay.

• Socratic Discourses with an Introduction by A. D. Lindsay (1910)
• Berkeley's A New Theory of Vision and Other Select Philosophical Writings with an Introduction by A. D. Lindsay (1910)
• The Philosophy of Bergson (1911)
• Five Dialogues of Plato, bearing on Poetic Inspiration with an Introduction by A. D. Lindsay (1913)
• Mill's Utilitarianism, Liberty & Representative Government with an Introduction by A. D. Lindsay (1914)
• The Republic of Plato translated by A. D. Lindsay (1923)
• Karl Marx's Capital an introductory essay (1925)
• Kant, Ernest Benn Limited / Oxford University Press, 1934. 1970 edition, Folcroft Press. ASIN: B0006C6R8G
• The Two Moralities (1940)