Alexandre Louis Lefebvre de Cérisy (14 November 1798, Paris – 2 December 1867, le Bouchevilliers, near Gisors) was a French entomologist.
De Cérisy worked as clerk to a solicitor.
Basing his studies on the use of the wing veins for the classification of Hymenoptera, he proposed in 1842, a similar system of classification (based on the veins of the wings) for butterflies.
He traveled throughout Europe, sometimes accompanied by naturalists such as Achille Rémy Percheron (1797-1869) in Provence and Gabriel Bibron (1805-1848) in Sicily.
He was at the founding meeting, February 29, 1832, of the Société entomologique de France Species of Lepidoptera named in honor of Cérisy are: Allancastria cerisyi (Godart, 1822) and Smerinthus cerisyi (Kirby, 1837).