Parmelia rojoi is a species of foliose (leafy), saxicolous (rock-dwelling) lichen in the large family Parmeliaceae.

Parmelia rojoi was formally described as a new species in 2020 by Ana Crespo, Víctor Jiménez Rico, and Pradeep Kumar Divakar.

The lobes comprising the thallus are brittle when dry and have a slight pruina on their margins; they measure up to 4.5 cm (1.8 in) wide.

The underside of the thallus is brown to black, and has abundant simple or furcate rhizines serving as holdfasts to attach the lichen to its rock growing surface.

It grows on sun-exposed sandstone in humid forests that are dominated by oak and Olea, and has been documented at elevations of about 487 m (1,598 ft).