Caloplaca allanii is a species of saxicolous (rock-dwelling) and crustose lichen in the family Teloschistaceae.

[1] The type specimen was collected by Lucy Cranwell on Anawhata Beach (Waitākere Ranges, West Auckland) in 1932; she sent a dried specimen to Zahlbruckner for identification.

[2] The specific epithet allanii honours New Zealand botanist Harry Allan.

Caloplaca allanii is endemic to the Waitakere Ranges coastline west of Auckland, and has been recorded from Bethells Beach south to northern Manukau Heads.

The lichen contains several secondary chemicals, including emodin, erythroglaucin, fallacinal, parietin, teloschistin, and xanthorin.