Trimeresurus purpureomaculatus is a venomous pit viper species native to India, Bangladesh and Southeast Asia.

[7] Body color highly variable: above olive, grayish, to dark purplish brown; below whitish, greenish or brown, uniform or spotted with brown; a light line on scale row one bordering ventrals present or absent; head olive, heavily suffused with brown.

[7] Ventrals: males 160-179, females 168-183; subcaudals: males 74-76, females 56-63, paired; hemipenes without spines.

[8] Found in Bangladesh, Burma, Thailand, West Malaysia, Singapore and Indonesia (Sumatra and Java).

The type locality is listed as "Singapore".