John Farmer (c 1570–c 1601) was an English composer, mainly of madrigals. He is probably one of the less well-known composers of the English Madrigal School. He was under the patronage of Earl of Oxford and he dedicated his collection of canons and his late madrigal volume to his patron. In 1595, Farmer was appointed Organist and Master of Children at Christ Church Cathedral, Oxford. In 1599, he moved to London and published his only collection of four-part madrigals.