Buellia gypsyensis is a species of crustose lichen in the family Caliciaceae.

Found in the Falkland Islands, it was described as a new species in 2019 by British lichenologist Alan Fryday.

The type was collected from Gypsy Cove near Port Stanley in East Falkland, where it was found growing on a north-facing rock; it is named for its type locality.

The main distinguishing characteristics of the lichen are its filiform (threadlike) conidia and the presence of 5-O-methylhiascic acid as the major secondary chemical in the thallus.

[2] In 2020, Buellia gypsyensis was assessed as a vulnerable species for the global IUCN Red List.