The Himalayan keelback (Herpetoreas platyceps) is a species of grass snake in the family Colubridae.

H. platyceps is known from India along the sub-Himalayan region, Nepal, Bangladesh, Pakistan, Bhutan and China between 1000 and 3600 m elevation (about 3,300 to 11,800 feet).

H. platyceps has the following characteristics: Eye moderate; rostral just visible from above; suture between the internasals as long as that between the pre-frontals or shorter; frontal longer than its distance from the end of the snout, shorter than the parietals; loreal longer than deep; one preocular (sometimes divided); two or three postoculars; temporals 1+1, or 1+2, or 2+2; 8 upper labials, third, fourth, and fifth entering the eye; 4 or 5 lower labials in contact with the anterior chin shields, which are much shorter than the posterior chin shields.

Dorsal scales in 19 rows, faintly or feebly keeled.

Olive-brown above, with small black spots; frequently two black parallel lines or an elliptic marking on the nape; a light, black-edged streak on each side of the head, or a black line from eye to gape (corner of mouth); belly yellowish, with or without blackish dots; frequently a black line or series of elongate blackish spots along each side of the belly; lower surface of tail frequently mottled with blackish; throat sometimes black.