Five new species of the genus Dujardinascaris Baylis, 1947 are described from Old World crocodilians: D. petterae n. sp. in Osteolaemus tetraspis from the Congo, Central Africa; D. blairi n. sp in Crocodylus johnstoni from Northern Australia; D. harrisae n. sp., D. angusae n. sp., and D. westonae n. sp. in C. porosus from Papua New Guinea. The species are differentiated by the relative length of the spicules, the shape of the gubernaculum and the form of the male tail. Females of the species cannot be readily distinguished morphologically.