Munmorah Conglomerate is a geologic formation in the Sydney Basin in eastern Australia.

Formed in the early-Triassic, it is part of the Narrabeen Group of sedimentary rocks.

This formation includes medium to coarse-grained sandstone and conglomerate.

Below the Munmorah Conglomerates are Newcastle Coal Measures, originating from the Permian.

This article about a specific Australian geological feature is a stub.