Nepenthes smilesii (/nɪˈpɛnθiːz ˈsmaɪlziaɪ, - smaɪˈliːziaɪ/) is a tropical pitcher plant native to northeastern Thailand, southern Laos, Cambodia,[3][4] and Vietnam.

[5][6][7] Nepenthes smilesii can tolerate an extended dry season and is most common in open, sandy savannah and grassland.

[6] The specific epithet smilesii refers to plant collector Frederick Henry Smiles, who made the first known collection of this species.

[6] Nepenthes smilesii is a climbing plant growing to a height of 5 m.[5] Its leaves are sessile and coriaceous (leathery) in texture.

[8] Nepenthes smilesii appears most closely allied to N. kongkandana and may be difficult to distinguish from that species.