Sir Arnold Edward Trevor Bax, KCVO (8 November 1883 – 3 October 1953) was an English composer, poet, and author. His prolific output includes songs, choral music, chamber pieces, and solo piano works, but he is best known for his orchestral music. In addition to a series of symphonic poems he wrote seven symphonies and was for a time widely regarded as the leading British symphonist.