L. occidentalis

L. occidentalis may refer to:
 * Leptochilus occidentalis, a wasp species in the genus Leptochilus
 * Leptoglossus occidentalis, the western conifer seed bug, a true bug species native to California, Oregon and Nevada, United States
 * Leptotyphlops occidentalis, the Western thread snake
 * Linderiella occidentalis, the California fairy shrimp, a shrimp species native to California
 * Lepisosteus occidentalis, a gar that lived from the late Cretaceous to Eocene.