Jacobus Ludovicus Cornet, also known by his initials as J.L. Cornet, was a Dutch painter and draughtsman. He often depicted Dutch historic scenes and figures, contributing several paintings to Jacob de Vos Jacobszoon's gallery of oil paintings depicting scenes from Dutch history. Cornet also painted and drew portraits, landscapes, interiors and a range of other subjects.
He served as head of the Prentenkabinet in Leiden from 1851 to his death in 1882. After his death, no successor was appointed, and large portions of the collection were transferred to the Rijksprentenkabinet, now part of the Rijksmuseum in Amsterdam.
Cornet received instruction in drawing in Leiden but was largely self-taught. He was one of the founders of the Lakenhal museum in Leiden. He was also a director of the Leiden artists' society Ars Aemula Naturae and a member of the Amsterdam artists' society Arti et Amicitiae.