Gyalideopsis vainioi is a species of lichen in the family Gomphillaceae. It was described as new to science in 1988 by Klaus Kalb and Antonín Vězda from Brazilian collections. The variety Gyalideopsis vainioi var. semicirculata was published in 2007; it was found in Florida. The specific epithet honours Finnish lichenologist Edvard Vainio, known for his pioneering work with Brazilian lichens.