C. grandis may refer to: * Calomyscus grandis, the noble calomyscus, a mouse-like hamster species from Iran * , a flowering plant species in the genus Calyptranthes * Camarasaurus grandis, a dinosaur species * , a spider species in the genus Cantuaria found in New Zealand * , a flowering plant species in the genus Capparis * Cassia grandis, the pink shower cassia, a plant species * , the large laelia, an orchid species in the genus Cattleya found in Brazil * , a botfly species in the genus Cephenemyia * Chionodes grandis, a moth species in the genus Chionodes * Chrysichthys grandis, the kukumai, a fish species found in Africa * , a snipe fly species in the genus Chrysopilus * Citrus grandis, the pomelo, a fruit plant native to Southeast Asia * , a rove beetle species in the ge