Ocellularia subleucina is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae.

Found in south-eastern Thailand, it was formally described as a new species in 2002 by lichenologists Natsurang Homchantara and Brian J. Coppins.

The type specimen was collected in Khao Khitchakut National Park (Chanthaburi Province); here it was found growing on trees in a lowland forest at an elevation of 400 m (1,300 ft).

The lichen has a smooth to finely wrinkled, grey olivaceous thallus with a dense cortex and a white medulla.

The specific epithet subleucina refers to its similarity with Ocellularia leucina, a lookalike species with smaller ascospores that contains psoromic acid.