Polynoids are a diverse group of polychaetes which, although not abundant, are almost always found in faunistic studies. In the Mexican Pacific, 83 species have been recorded; most have not been recently reviewed. The main problem with the recorded species is misidentification due to unclear taxonomic features. As part of a faunistic study and a taxonomic review of polynoids from the Mexican Pacific coast (MP), polynoid types and supplementary materials described for the MP and other Eastern Pacific (EP) sites were examined, principally for specimens from Arctonoinae, Lepidastheniinae, Lepidonotinae, and Polynoinae. Part of the results were systematized and are presented as an annotated list of the 30 species examined and a taxonomic key for the 61 polynoid species recorded in the MP; both include commentaries about the generic and specific status and geographic distribution of all the species. The list and key will facilitate the knowledge and study of polynoid biodiversity in the MP as well in the EP