Moses Gaster (17 September 1856 – 5 March 1939) was a Romanian-born British scholar, the Hakham of the Spanish and Portuguese Jewish congregation, London, and a Hebrew linguist. He was the father of Jack and Theodor Gaster and the grandfather of Marghanita Laski. He was also son-in-law to Michael Friedländer and father-in-law to Neville Laski.