Sir Alfred Herbert Brewer (21 June 1865 – 1 March 1928) was an English composer and organist. As organist of Gloucester Cathedral from 1896 until his death, he contributed a good deal to the Three Choirs Festival for 30 years. Brewer lived in Gloucester his whole life. He was the organist at two of its churches, and also founded the city's choral society in 1905. He had been a Gloucester Cathedral chorister in his boyhood, and began his organ studies there under C. H. Lloyd. He was educated at the Cathedral School, Oxford and at the Royal College of Music.