Lost Valley

Lost Valley may be:
 * Lost Valley (Antarctica)
 * Lost Valley Scout Reservation, a Boy Scouts of America camp in California
 * Lost Valley Ski Area, in Maine, United States
 * Lost Valley Educational Center, in Oregon, United States
 * "The Lost Valley of Iskander", a short story by Robert E. Howard, published in 1974
 * Lost Valley (Arkansas), a point near Arkansas Highway 74
 * Lost Valley (film), a 1997 New Zealand film
 * Coire Gabhail, the Lost Valley or Hidden Valley in Bidean nam Bian in Scotland