Otto Stoll (29 December 1849 in Frauenfeld – 18 August 1922 in Zürich) was a Swiss linguist and ethnologist.
Otto Stoll was a professor of ethnology and geography at the University of Zurich who specialized in research of Mayan languages. From 1878 to 1883 he conducted scientific studies in Guatemala. He was the author of several treatises on Guatemala, including important works in the fields on ethnography and ethno-linguistics. Stoll also published on neotropical Acari with a major work being the volume in the Biologia Centrali-Americana between Dec. 1886 and Jan. 1893.