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