The Santa Rosa Wilderness is a   wilderness area in Southern California, in the Santa Rosa Mountains of Riverside and San Diego counties, California. It is in the Colorado Desert section of the Sonoran Desert, above the Coachella Valley and Lower Colorado River Valley regions in a Peninsular Range, between La Quinta to the north and Anza Borrego Desert State Park to the south. The United States Congress established the wilderness in 1984 with the passage of the California Wilderness Act (Public Law 98-425), managed by the both US Forest Service (San Bernardino National Forest, 13,801 acres) and the Bureau of Land Management (58,458 acres ). In 2009, the Omnibus Public Land Management Act (P.L. 111-11) was signed into law which added more than . Most of the Santa Rosa Wilderness is within the Santa Rosa and San Jacinto Mountains National Monument.