Nepenthes reinwardtiana /nɪˈpɛnθiːz ˌraɪnwɔːrtiˈɑːnə/ is a tropical pitcher plant native to Borneo and Sumatra[3] and to a number of smaller surrounding islands including Bangka, Natuna,[4] Nias, and Siberut.

[14] The taxon is only known from Keningau-Kimanis Road and the foot of Mount Trus Madi, both in Sabah, Borneo, where it grows at an elevation of 1400 to 1424 m in open secondary vegetation.

[citation needed] However, some authors consider these differences too small for species status and treat N. naquiyuddinii as a heterotypic synonym of N.

[15][16] Alternatively, N. naquiyuddinii may represent a natural hybrid involving N. fusca and N. reinwardtiana, the only species that are sympatric with it.

[17] In 2001, Charles Clarke performed a cladistic analysis of the Nepenthes species of Sumatra and Peninsular Malaysia using 70 morphological characteristics of each taxon.