Étienne Léopold Trouvelot (December 26, 1827 – April 22, 1895) was a French artist, astronomer and amateur entomologist.
His interest in astronomy was apparently piqued in 1870 when he witnessed several auroras and, when the director of Harvard College Observatory saw the quality of his illustrations, he invited Trouvelot to join the staff there in 1872. During the course of his life he produced around 7,000 astronomical illustrations.