Tenaya Canyon is a dramatic and dangerous canyon in Yosemite National Park, California, USA, that runs from the outlet of Tenaya Lake 10 miles down to Yosemite Valley, carrying water in Tenaya Creek through a series of spectacular cascades and pools and thence into a deep canyon below Cloud's Rest, a giant granite mountain adjacent to Half Dome. Waterfalls on the creek inside the canyon include Pywiack Cascade and Three Chute Falls, near Mirror Lake.
The top of the canyon can be seen from Tioga Pass Road, which goes through Tuolumne Meadows and Tioga Pass. From Olmsted Point, Clouds Rest and Yosemite's signature Half Dome dominate the canyon. At the bottom of the canyon, in Yosemite Valley, lies Mirror Lake, accessible by shuttle bus and a short walk. The Quarter Domes are not far, up Tenaya Canyon.
The canyon has no foot trail and is notoriously difficult to navigate, particularly in spring and summer when water levels are high. Signs warn against hiking in the canyon. The American Canyoneering Association gives Tenaya Canyon a rating of 3B V.