This study recognises eight species of Paradiopatra from eastern Australian waters, of which only one, Paradiopatra ehlersi, had been previously recorded. Six species are newly described: P. acirrata n. sp., P. imajimai n. sp., P. longicappa n. sp., P. piccola n. sp., P. s p in o s a n. sp., P. variabilis n. sp., and one species is reported as P. cf. papillata. Descriptions of all species (with the exception of P. e h le r s i) are given, accompanied by detailed illustrations, including scanning electron micrographs and drawings. A key to all 32 species of the genus is included plus a table summarising specific diagnostic characters of the Australian representatives.