"Nepenthes longifolia" is not listed on the 2006 IUCN Red List of Threatened Species as the list follows Jebb and Cheek in treating "N. longifolia" in synonymy with "N. sumatrana". The combined conservation status for both taxa is listed as Least Concern. However, recent studies have shown that these two taxa are distinct species. In 2001, Charles Clarke suggested a revised status of Vulnerable for "N. longifolia" based on the IUCN criteria. The habitat of this species may be threatened in the near future by fires deliberately started to clear forest for agricultural purposes.