John Alexander Smith (21 April 1863 – 19 December 1939) was a British idealist philosopher, who was the Jowett Lecturer of philosophy at Balliol College, Oxford from 1896 to 1910, and Waynflete Professor of Moral and Metaphysical Philosophy, carrying a Fellowship at Magdalen College in the same university, from 1910 to 1936. He was born in Dingwall and died in Oxford.