Giorgio Jan (21 December 1791 in Vienna – 8 May 1866, Milan) was an Italian taxonomist, zoologist, botanist, herpetologist, and writer.

[1] In Parma he continued to offer exsiccata-like series with plant specimens for sale, an example being the Herbarium portatile with the species list published in 1820.

[2] At that time, the Duchy of Parma was no longer under Austrian jurisdiction following the Congress of Vienna after the defeat of Napoleon at Waterloo.

Jan's main interest was botany, but he made immense collections of natural history, including fossils and minerals.

[3][4] In the 1860s he began compiling what was to become the Iconographie Général des Ophidiens, an extensive illustrated collection of scientific papers relating to snakes, but he died before it was completed.