Rhabdophis rhodomelas, the blueneck keelback or blue-necked keelback, is a species of snake in the subfamily Natricinae of the family Colubridae. It is found in the Malay Peninsula (southern Thailand, Peninsular Malaysia, Singapore), Borneo (Sarawak and Sabah, Malaysia; Kalimantan, Indonesia), and in the western parts of the Indonesian Archipelago (Sumatra, Java, Bangka Island). Rhabdophis rhodomelas is an uncommon species known from lowland forest near riparian areas at elevations less than 200 m (660 ft) above sea level. It is oviparous, with fecundity up to 27 eggs.