Eric William Fenby OBE (22 April 1906 – 18 February 1997) was an English composer and teacher who is best known for being Frederick Delius's amanuensis from 1928 to 1934. He helped Delius realise a number of works that would not otherwise have been forthcoming.

Fenby was born in Scarborough, North Yorkshire, and as a youth took lessons in the piano, organ and cello. At the age of 12 he was appointed organist at Holy Trinity Church. As a composer he was largely self taught. By 1925 he had conducted a work for string orchestra at the Spa Grand Hall in Scarborough and had written some minor pieces.