Aristide Cavaillé-Coll (born in Montpellier, 4 February 1811; died in Paris, 13 October 1899) was a French organ-builder. He invented many new mechanical devices and his organs changed the way that composers could write for the instrument. César Franck, Alexandre Guilmant, and Charles-Marie Widor, in particular, were strongly influenced by the new type of organ that he was building.