Alan Walker Tyson, CBE, FBA (27 October 1926 – 10 November 2000) was a Glasgow-born British musicologist who specialized in studies of the music of Wolfgang Amadeus Mozart and Ludwig van Beethoven.
He wrote the (deliberately concise) Thematic catalogue of the works of Muzio Clementi which appeared in 1967 at Hans Schneider of Tutzing/Germany, with no following editions up to date.
His interest in watermarks and paper studies on Beethoven scores actually predated his involvement in those of Mozart.
Prior to becoming intensely involved in musicology, Tyson was lecturer in Psychopathology and Developmental Psychology at Oxford from 1968 to 1970.
He was co-editor of The Standard Edition of the Complete Psychological Works of Sigmund Freud for which he also translated some texts, notably Leonardo da Vinci, A Memory of His Childhood and The Psychopathology of Everyday Life.