François-Xavier Bélanger (1833 – 19 January 1882) was a French-Canadian naturalist and museum curator. An autodidact like many naturalists of the time, he specialized in the study of Microlepidoptera. Thanks to the influence of Léon Abel Provancher and Thomas-Étienne Hamel, he became curator of the zoology museum at Université Laval, where although he did a good job of enlarging the total collection, he did so in a generally poorly organized way. He was succeeded by his assistant curator Charles-Eusèbe Dionne.