Joseph Horovitz (born 26 May 1926) is a British composer and conductor.
Horovitz was born in Vienna, Austria. His Jewish family emigrated to England in 1938 to escape the Nazis. His father was the publisher Béla Horovitz, the co-founder in 1923, with Ludwig Goldscheider, of Phaidon Press. His sister was the classical music promoter Hannah Horovitz (1936-2010).
He studied music and modern languages at New College, Oxford, and later attended the Royal College of Music in London, studying composition with Gordon Jacob. He then undertook a year of further study with Nadia Boulanger in Paris. His musical career began in 1950, when he became music director at the Bristol Old Vic. He was subsequently active as a conductor of ballet and opera, and toured Europe and the United States.
Horovitz married Anna in 1956, shortly after coaching at the bi-centenary celebration for Mozart and Glyndeborne. They honeymooned in Majorca, staying in Paguera and visiting Valldemossa. He later used these two names for two clarinet pieces, based on Spanish folk-tunes he had heard there.
Horovitz has been Professor of Composition at the Royal College of Music since 1961, and a Council Member of the Composers' Guild of Great Britain since 1970. Between 1969 and 1996 he belonged to the board of the Performing Rights Society. His works include 16 ballets, including Alice in Wonderland (1953), 2 one-act operas (The Dumb Wife, libretto Peter Shaffer; Gentlemen’s Island, libretto Gordon Snell), and concertos for violin, oboe, clarinet, bassoon, trumpet, euphonium, tuba and percussion, as well as a popular and often performed jazz concerto for harpsichord or piano.