Arthur David Jacobs (14 June 1922 – 13 December 1996) was an English musicologist, music critic, teacher, librettist and translator. Among his many books, two of the best known are his Penguin Dictionary of Music, which was reprinted in several editions between 1958 and 1996, and his biography of Arthur Sullivan, which was praised by critics in Britain and America. As an academic, Jacobs taught at the Royal Academy of Music, at Huddersfield Polytechnic, and at universities in the US, Canada, and Australia.