A new species of the Oligodon cyclurus-group is described from southern Vietnam and Cambodia, Oligodon saintgironsi
spec. nov. It differs from other members of this group by the combination of 19 scale rows at the neck, 17 or 18 dorsal
scale rows at midbody, a long and robust tail, very long and thin hemipenes, and a blotched pattern. It is most similar to
Oligodon ocellatus (Morice, 1875). Oligodon analepticos Campden-Main, 1970 is confirmed as a synonym of Oligodon
ocellatus. A key to the Oligodon cyclurus-group is provided.