The spatula-toothed snake (Iguanognathus werneri) is a species of snake in the family Colubridae. The species is endemic to Indonesia.
The specific name, werneri, is in honor of Austrian herpetologist Franz Werner.
All the teeth of I. werneri (mandibular, maxillary, and palatal) have spatulate crowns, which are ribbed along the outer side. The holotype, which is a female, has a total length of 35 cm (14 in), including a tail 8.7 cm (3.4 in) long.
I. werneri is known only from the holotype, which was collected in Sumatra, Indonesia.
The natural habitat of I. werneri is unknown.
I. werneri is oviparous.
