Isla Natividad is an island in the Pacific Ocean 6 km west off Punta Eugenia, the northwestern headland of the Mexican state of Baja California Sur. 200 meters off its northwestern end lies Roca María at , with an area of 0.074 km². Isla Natividad is separated from the mainland at Punta Eugenia by Canal de Dewey (Dewey's Channel), and from Cedros Island (Baja California), which is 15 km to the north, by Canal de Keller (Canal Kellett).
The island is part of Bahía Tortugas delegación of Mulegé municipality. It is 8.655 km² in area. At the 2001 census, the island had a population of 384, centered in Natividad, a community of abalone, lobster, and clam fishermen, at the southeastern end ( ). Connection to the mainland is facilitated by an airstrip. There is a lighthouse in the northern part.
Geography and ecology
It has steep rocky shores fringed by rocks and kelp except for a small sandy beach towards the mainland. The island is barren and hilly with a peak 150 m high rising near its center. The flora consists mainly of a dense cover of Mesembryanthemum crystallinum and M. nodiflorum, cacti, and small shrubs. There are no endemic plants or animals on Natividad due to its proximity to the mainland (it was probably part of the mainland several times during the ice ages, when sea levels were lower). However, Mammillaria pondii and a little-researched Opuntioideae cactus, as well as Mentzelia hirsutissima var. nesiotes are found in few other places. Native land vertebrates are few, including the deer mouse Peromyscus maniculatus and some lizards. Seabirds – namely Brandt's Cormorant – and seals use the island as a breeding and resting site. Isla Natividad is one of the southernmost breeding locations of Cassin's Auklet and a main breeding site for Black-vented Shearwaters.
- National Geospatial-Intelligence Agency (2004): Sector 2 – West coast of Baja California. In: PUB153 Sailing Directions (Enroute): West Coasts of Mexico & Central America (10th ed.): 9–18. ProStar Publications, Inc. ISBN 1-57785-559-0
- Instituto Nacional de Estadística, Geografía e Informática (2007): Principales resultados por localidad 2005 (ITER) ["Principal results of the 2005 census by locality"] [in Spanish]. Retrieved 2007-OCT-10.
- Thayer, John E. & Bangs, Outram (1907). "Birds Collected by W. W. Brown, Jr., on Cerros, San Benito and Natividad Islands in the Spring of 1906, with Notes on the Biota of the Islands". Condor 9 (3): 77–81. doi:10.2307/1361136.
- California/Mexico Island Conservation Database (2007): Plant accounts: Guadalupe Island. Retrieved 2007-OCT-10.