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The Palaeoarchaean (Paleoarchean) is the second geological era in the Archaean. It began 3.6 billion years ago and ended at 3.2 billion years ago.[1] Before it was the Eoarchaean and after it was the Mesoarchaean.

The name comes from the Greek word palaios. Palaios means "ancient". The oldest fossil life forms are cyanobacteria found in strata 3.46 billion years old. These rocks are in Western Australia.

The first supercontinent, Vaalbara, formed during this period.