The species belonging to Ochrolechia occurring in southern South America are revised. 8 taxa are accepted. Descriptions of the species and a key to the taxa are included. O. blandior is reduced to synonymy with O. pallescens, O. antarctica and O. ocelliformis with O. parella and O. pseudotartarea with O. szatalaensis. O. androgyna is a new record for South America and O. frigida is new to Chile