Thirty-eight species of the genus Stelis (Orchidaceae) from Colombia, or species that can be expected to be found in Colombia, are described, three as new species (S. dapidis, S. nostalgia, and S. peregrina). Thirty-two species are illustrated, thirteen multiple times. Already existing illustrations are cited for six species. A lectotype is selected for Pleurothallis pristis and a neotype for S. guatemalensis.