Plectanocotyle is a genus of monogeneans in the family Plectanocotylidae.

It includes five species of parasites on the gills of fish.

[1] According to a study funded by The Swedish Taxonomy Initiative,[1] there are four valid species in this genus: Plectanocotyle elliptica Diesing, 1850: described probabley based on a mutilated specimen, and most importantly, it was suggested that either the host fish had been misidentified or the specimen had been mislabeled as to origin (Price, 1961).

[1] Plectanocotyle caudata Lebour, 1908: considered currently synonym of P.

[1] Plectanocotyle lorenzii Monticelli, 1899: considered currently a species inquirenda.