Louis Rendu (9 December 1789 in Meyrin – 20 August 1859) was a French Roman Catholic bishop of Annecy and a scientist.

[2] He was ordained a priest on 19 June 1814, and appointed a teacher of belles lettres at the Collège royale de Chambéry.

He was a founding member of the Académie des sciences, belles-lettres et arts de Savoie in 1819, along with Alexis Billiet, future archbishop of Chambéry, and the society's permanent secretary.

[7] He was nominated bishop of Annecy by King Charles Albert of Sardinia on 25 August 1842, and approved by Pope Gregory XVI on 27 January 1843.

[14] Rendu was the author of Theorie des glaciers de la Savoie,[15] an important book on the mechanisms of glacial motion.