C. occidentalis

C. occidentalis may refer to:
 * plant
 * Calyptronoma occidentalis, a palm species endemic to Jamaica
 * Canna occidentalis, a garden plant
 * Carex occidentalis, a sedge species
 * Celtis occidentalis, the common hackberry, a tree species native to North America
 * Cephalanthus occidentalis, the buttonbush, a flowering plant species native to eastern and southern North America
 * Cercis occidentalis, the western redbud, a tree native to western North America
 * animal
 * Crenadactylus occidentalis, tiny gecko species native to Western Australia