Five new species of tube building amphipods in the genus Cerapus are described from Australian waters: Cerapus brevirostris sp. nov., C. chiltoni sp. nov., C. dildilgang sp. nov., C. lowryi sp. nov. and C. moonamoona sp. nov. All five new species build tubes from sediment or sediment and detritus. These bring the number of species of Cerapus in Australian waters to ten. A key to Australian species is provided.