Neolissochilus subterraneus, commonly known as the cave brook carp,[1] is a species of cyprinid cavefish that is endemic to the Tham Phra Wang Daeng cave within Thung Salaeng Luang National Park, Phitsanulok Province in Thailand.

[2] The genus name derives from the Greek words "neos", "lissos", and "cheilos"; they mean new, smooth, and lip respectively.

[2] Neolissochilus subterraneus lives primarily if not exclusively in the Tham Phra Wang Daeng cave at a depth of 0–2 metres (0–7 ft).

Fish at different life stages inhabit different areas of the cave.

[2] Neolissochilus subterraneus has a largely detritus-based diet, along with bat guano.