Cyanothamnus montimulliganensis is a plant in the citrus family Rutaceae and is endemic to a single mountain in Queensland.

It is an erect, woody shrub with pinnate or bipinnate leaves and white, four-petalled flowers usually arranged singly in leaf axils.

The flowers are white and are usually arranged singly, sometimes in groups of up to three, in leaf axils, on a pedicel about 1 mm (0.04 in) long.

[4] The specific epithet (montimulliganensis) refers to the isolated Mount Mulligan, the only place where this species is known to occur.

[3] In a 2013 paper in the journal Taxon, Marco Duretto and others changed the name to Cyanothamnus montimulliganensis on the basis of cladistic analysis.