Willett Hot Springs is a natural thermal spring in the Sespe Wilderness north of Ojai, California. Known as a remote backcountry soaking spot rather than a developed resort, it uses a man-made basin to collect the spring water. Its isolation comes largely from the usual approach, an approximately eleven-mile hike from the Piedra Blanca trailhead in Los Padres National Forest. Another notable spring nearby, Sespe Hot Springs, lies about three miles away and is recognized as one of the hottest springs in California.