Nepenthes eustachya is a lowland species endemic to Sumatra. The plant produces some of the most gaudy traps in the genus, with pitchers coloured with splashes of cream, red and green. These pitchers have an unusually bulbous base topped with a cylindrical wall. They are medium in size, attaining around 20 cm in height.

The species is endemic to North and West Sumatra, where it grows from 0-1600 m elevation. It is associated with exposed sandstone habitats and vines on top of low lying shrubs.

I found this species during my 2018 Expedition to Sumatra.