A taxonomic revision of the genus Placidiopsis in the Iberian Peninsula and the Balearic Islands is provided. A total of 500 specimens were studied. A detailed description of the morphology, anatomy, ecology, and distributional rank is presented for each species. Additionally, a key to Placidiopsis species is included. The genus is represented by four species in the studied region, with P. cavicola and P. cinereoides known only from the type localities and P. cinerascens and P. custnani common in the eastern half of the region. These data expand considerably the ecological and distributional range of these species in the Iberian Peninsula.