Brian Brockless (21 January 1926 – 18 December 1995) was an English composer, organist and conductor and, for much of his life, was the Director of Music at the Priory Church of St Bartholomew-the-Great, Smithfield, London where he succeeded Paul Steinitz in 1961. He was a much respected Choral Trainer and his annual performances of Bach's St John Passion were noted for their musicality. He was the founder of Pro Cantione Antiqua, originally known as the St Bartholomew Singers.