Jean Étienne Duby (15 February 1798 in Geneva – 24 November 1885) was a Swiss clergyman and botanist.
As a young man he was influenced by Augustin Pyramus de Candolle (1778–1841), and made contributions towards Candolle's publication of Botanicon gallicum; seu Synopsis plantarum in Flora gallica descriptarum (1828-1830).
[1] From 1831 to 1863 he served as a pastor in Eaux-Vives, Geneva, while in the meantime playing an active role in botany.
He specialized in research of cryptogams, including studies of European and exotic mosses, and taxonomic work involving the red algae genus Ceramium.
In addition to his work with cryptogams, he conducted studies on the flowering plant family Primulaceae.