Jubilate Agno (Latin: "Rejoice in the Lamb") is a religious poem by Christopher Smart, and was written between 1759 and 1763, during Smart's confinement for insanity in St. Luke's Hospital, Bethnal Green, London. The poem was first published in 1939 under the title Rejoice in the Lamb: A Song from Bedlam, and edited by W. F. Stead from Smart's manuscript, which Stead had discovered in a private library.