Ocellularia cloonanii is a species of corticolous lichen in the family Graphidaceae.

Found in Sri Lanka, it was formally described as a new species in 2014 by lichenologists Gothamie Weerakoon, Robert Lücking, and Helge Thorsten Lumbsch.

The type specimen was collected from a high-elevation montane forest in the Fishing Hut Tea Estate (Sabaragamuwa Province) at an altitude of 1,870 m (6,140 ft).

The specific epithet cloonanii honours Colman Patrick Cloonan, "for his immense help in carrying out the research studies".

Ocellularia cloonanii has an olive-grey thallus up to 5 cm (2 in) in diameter, with continuous but uneven surface.