P. nanus

P. nanus may refer to:
 * Philautus nanus, an extinct frog species endemic to Sri Lanka
 * Phrynobatrachus nanus, a frog species found in Chad and possibly Central African Republic
 * Phrynopus nanus, a frog species endemic to Colombia
 * Physalaemus nanus, a frog species endemic to Brazil
 * Pleurocoelus nanus, a dinosaur species from the Early Cretaceous found in North America
 * Pseudomys nanus, the western chestnut mouse, a rodent species found only in Australia
 * Pyrgulopsis nanus, the distal-gland springsnail, a freshwater snail species