Hill Canyon is a deep canyon in the western Simi Hills and within northern Newbury Park and Thousand Oaks, in Ventura County, southern California.
The Arroyo Conejo Nature Preserve includes the central canyon area, and is part of the Conejo Canyons Open Space. It has trails connecting it to Santa Rosa Valley County Park at the canyon's mouth, to Wildwood Regional Park east of the canyon, and to Rancho Conejo Playfields southwest of the canyon.