Mountain House or Willow Springs Station, in what is now Kern County, California, was a stage station of the Butterfield Overland Mail, located south of Fountain Spring Station, and northeast of Posey Creek Station at Willow Springs on Willow Springs Creek.
Mountain House is a California Historical Landmark. On October 13, 1957, the California State Park Commission erected marker number 589 south of it. Mountain House Station California Historical Landmark, signed May 22, 1957, reads: