The Nam Phouy National Biodiversity Conservation Area is a protected area located in Sainyabuli Province, Laos. It is named after Nam Phouy village, also known as "Nam Phoun" and is one of the 21 National Biodiversity Conservation Areas established by the Lao government. The NBCA is located in the forested mountains of the Luang Prabang Range close to the border with Thailand and is part of the Luang Prabang montane rain forests ecoregion.