Hans Karl Ferdinand John (born 7 September 1936) is a German musicologist and former university professor.
In 1961 he was awarded his doctorate under Fritz Reuter at the Faculty of Philosophy in Berlin with the dissertation Music education in ancient Greece and its relevance for our time.
He then worked for 25 years at the Hochschule für Musik Carl Maria von Weber Dresden as a lecturer and professor of musicology.
Hans John has published numerous musicological articles, among others on Carl Maria von Weber, Robert Schumann, Franz Liszt, Karol Lipiński, Richard Wagner and the history of the Hochschule für Musik Carl Maria von Weber Dresden.
He participated as a speaker at numerous international musicological congresses, among others in Oxford, Sintra, Copenhagen St. Petersburg, Breslau, Berlin and Dresden.