Gustav Hegi (13 November 1876 in Rickenbach, Canton of Zürich - 23 April 1932 in Goldbach, Canton of Zürich) was a Swiss botanist. His name is particularly associated with editing the multi-volume work Illustrierte Flora von Mittel-Europa (Illustrated Flora of Central Europe), which is one of the most comprehensive floras in the World. It contains extensive morphological, ecological and phytogeographical of all plant species occurring in Central Europe.