We describe, from the Muller Range of New Guinea, three new species of microhylid frogs, one each in the genera Albericus, Cophixalus, and Oreophryne. Th e new Albericus is unique in its combination of having an infrequent peeping call, oblique lores, wide snout and fi nger discs, and distinct tympanum. Th e new Cophixalus is distinguished by its combination of fi nger discs larger than toe discs, third toe longer than fi fth, distinct tympanum, curved scapular ridges, dark postocular stripe, dark W-shaped mark above the shoulders, and having a call consisting of a rapid series of 6-9 musical peeps. Th e Oreophryne is unique in its combination of having a cartilaginous connection of the procoracoid to the scapula, no webbing between the toes, fi fth toe longer than third, short snout, dark face, and call consisting of an extended multi-note chuckle or cackle. Each species was either common or abundant. Th e new Cophixalus shows a predilection for caves, although it is not restricted to them. Many frogs occurring in the central highlands of New Guinea are wide-ranging across much of this high-elevational region, but others are of restricted distribution. Th e species described herein are likely members of the latter group, although it remains to be determined whether each will prove endemic to the Muller Range.