Nepenthes reinwardtiana is a tropical pitcher plant native to Borneo and Sumatra and to a number of smaller surrounding islands including Bangka, Natuna, Nias, and Siberut. Although some sources have included Peninsular Malaysia and Singapore within the range of this species, these records appear to be erroneous.

Nepenthes reinwardtiana has an unusually wide altitudinal distribution of 0–2,200 m, being both a "lowland" and "highland" plant. There are many different colour forms, ranging from green to dark red. This species is known for the two "eye spots" on the inside surface of its pitchers.

The specific epithet reinwardtiana honours Caspar Georg Carl Reinwardt. The species has been given the vernacular name Reinwardt's pitcher-plant.

...