Pao brevirostris is a species of pufferfish in the family Tetraodontidae. It is a tropical freshwater species native to Asia, where it is known from the Mekong basin and the Chao Phraya drainage. It inhabits marshes and swamps with dense aquatic plant cover, and the species is known to frequently hide between roots and among submerged foliage. It can grow to 9.5 cm (3.7 in) standard length.