Jacques Delamain (10 September 1874, Jarnac – 5 February 1953, Saint-Brice, Charente) was a French naturalist who specialised in ornithology.
He was, from 1929, on the editorial committee of Alauda, Revue internationale d'Ornithologie [fr] with its founder Paul Paris and Louis Lavauden, Noël Mayaud, Henri Heim de Balsac, Jacques de Chavigny, Henri Jouard and Paul Poty.
Messiaen shared Delamain's fascination with birds, and throughout his career integrated birdsong into his compositions.
Delamain's guidance encouraged Messiaen to intensify and further systematize his transcription of birdsongs.
"[2] Messiaen's work Réveil des oiseaux (Awakening of the birds), first performed in 1953, is dedicated to Delamain's memory.