Hebius modestus, commonly known as the modest keelback or Günther's keelback, is a species of natricine snake endemic to Asia.

It is found in Burma, Cambodia, China (especially Guangdong, Guizhou, and Yunnan), India (particularly Assam, Meghalaya),[2] northern Laos, Thailand, and Vietnam.

Dorsally the modest keelback is olive brown with small black spots.

The dorsal scales are in 19 rows, weakly keeled.

[3] In India this species is found in forests at altitudes of 600-1,500 m (approximately 2,000-5,000 feet).