François-Nicolas Martinet

François-Nicolas Martinet (; 1731 - c. 1800) was a French engineer, engraver and naturalist. Although trained as an engineer and an architectural drafter, he began to produce engravings for books and it later became his primary profession.

Martinet's year of birth is known but sources are divided on the year of his death. Little is known of his life, a son, Aaron Martinet, became a print dealer in Paris. By 1756 he became engraver for the King's cabinet, reporting to the Maison du Roi. Martinet engraved the plates for numerous works on natural history, especially ornithology. Notable in particular are those for Buffon's natural history where he made 1008 engravings. He also contributed 21 ornithological illustrations to Diderot and d'Alembert's Encyclopédie.

His major work was for l'Ornithologia, sive Synopsis methodica of Mathurin Jacques Brisson (1760–63) to which he contributed extensively.

Some of his plates have been of importance in the taxonomy and identification of now extinct species. Some of his engravings were later hand coloured and these are not uniform or consistent across copies. He also produced illustrations of architecture, landscape, and theatre.