C. nanus

C. nanus may refer to:
 * Cercartetus nanus, the eastern pygmy possum, a marsupial species found in south-eastern Australia
 * Cerion nanus, an air-breathing land snail species
 * Choristotanyderus nanus, an extinct insect species living in the Permian period
 * Cisticola nanus, the tiny cisticola, a bird species found in Ethiopia, Kenya, Somalia and Sudan
 * Colobocarpos nanus, a plant species native to Laos and Northern Thailand
 * Corydoras nanus, a tropical freshwater fish species