Schaereria albomarginata is a species of saxicolous (rock-dwelling) lichen in the family Schaereriaceae.

Found in continental Antarctica, it was formally described as a new species in 2009 by Norwegian lichenologist Dag Øvstedal.

The type specimen was collected from the Wakefield Highlands in Eternity Range at an altitude of 2,200 m (7,200 ft).

Its thallus appears as small tufts up to 10 mm (0.4 in) in diameter on thick, pale, rhizomorphs with overlapping areolae.

The areolae are brown with a prominent white margin; this feature is referred to in the specific epithet albomarginata.