During a review of Australian Nysius Dallas, types of all species recorded from Australia and its territories and neighbouring areas in the South West Pacific were examined. As a result of this, the following synonymies have become necessary: Nysius andrewsi Izzard and N. usingeri Izzard as junior synonyms of N. vinitor Bergroth; N. clevelandensis Evans, N. turneri Evans, N. pacificus China, N. dissimilis Izzard, and N. villicus Van Duzee as junior synonyms of N. caledoniae Distant. Other species from Australia and the South West Pacific which have had their status confirmed in this study are: N. spectabilis Distant, N. pulchellus Stål, N. picipes Usinger, N. oceanicus Usinger, and N. femoratus Van Duzee. A lectotype is designated for N. vinitor Bergroth. A key to all species now recognised from Australia and the SW Pacific is provided.