C. major

C. major may refer to:
 * Ceramornis major, an extinct bird species from the Late Cretaceous
 * Cettia major, the chestnut-crowned bush warbler, a warbler species found in South Asia
 * Clusia major, the autograph tree or pitch-apple, a plant species
 * Copiula major, a frog species found in Indonesia and possibly Papua New Guinea
 * Ctenacanthus major, a prehistoric fish species