Nepenthes jamban (/nɪˈpɛnθiːz ˈdʒʌmbən/ ni-PEN-theez JUM-bən, not */ˈdʒæmbən/ JAM-bən) is a tropical pitcher plant endemic to northern Sumatra.

The specific epithet jamban is the Indonesian word for "toilet" and refers to the shape of the pitchers.

The species was first collected on April 22, 2005, south of Padang Sidempuan in the Indonesian province of North Sumatra.

[1] Nepenthes jamban is endemic to the Barisan Mountains that line the western side of Sumatra.

[2][3] Nepenthes jamban grows in upper montane mossy forest amongst summit scrub vegetation.

[3] The upper pitchers of N. jamban have been noted for trapping many large prey items, such as wasps and crickets, and relatively few small animals.

The traps of this species also support large populations of pitcher infauna, particularly mosquito larvae.

[1] Nepenthes jamban produces thick, mucilaginous pitcher liquid similar to that found in related species such as N. inermis.

Nepenthes jamban belongs to a group of related Sumatran species that includes N. dubia, N. inermis, N. jacquelineae, and N. tenuis.

It shares with these species features such as infundibulate pitchers which are wholly glandular on their inner surfaces, bracteate inflorescences, and sessile leaves.

[4] In addition, the two species can be easily distinguished on the basis of peristome morphology and floral characteristics.

N. jamban is not as robust as N. jacquelineae and lacks the greatly expanded peristome that is so characteristic of that species.

[3] In 2009, Adrian Y. Wartono observed a putative cross between N. dubia and N. jamban in an area where these two species grew with N. lingulata and N. rhombicaulis.

— Typus: Lee, Hernawati, Akhriadi NP 433 (ANDA), Indonesia, Sumatera Utara, Bukit Barisan, south of Padang Sidempuan, 22 April 2005.