Trimeresurus malabaricus, commonly known as Malabar pit viper, Malabar rock pit viper, or rock viper, is a venomous pit viper species endemic to the Western Ghats of southwestern India.
The species is endemic to Western Ghats mountains, occurring along the southern and western India at 600–2,000 metres (2,000–6,600 ft) elevation. The type locality is the Western Ghats of southwestern India. The Malabar pit viper is nocturnal and usually inactive in the day, sometimes seen basking on rocks or trees near streams. It is more commonly encountered during the monsoon months. The species preys upon frogs, lizards, nestling birds, musk shrews, mice and other small animals.