Cetrelia monachorum is a species of foliose lichen in the family Parmeliaceae.

It was first described scientifically in 1930 by Alexander Zahlbruckner as a species of Parmelia.

Husband and wife lichenologists William and Chicita Culberson transferred it into the genus Cetrelia in 1977.

It is found in Asia, Europe, and North America.

This Parmeliaceae-related article is a stub.