Jean Victor Arthur Guillou (18 April 1930 – 26 January 2019) was a French composer, organist, pianist, and pedagogue. Titular Organist at Saint Eustache in Paris, from 1963 to 2015, he was widely known as a composer of instrumental and vocal music focused on the organ, as an improviser, and as an adviser to organ builders. For several decades he held regular master classes in Zurich and in Paris.
