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
See also Major (disambiguation) C major – a key in music