Alexander Dunlop Lindsay, 1st Baron Lindsay of Birker CBE (14 May 1879, Glasgow - 18 March 1952) known as Sandie Lindsay, was a British academic and peer.His father was Reverend Thomas Martin Lindsay (1845-1914) and his mother Anna Dunlop (1845-1903). Lindsay was educated at The Glasgow Academy (from 1887), the University of Glasgow gaining an MA degree in 1899, and 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.