Wahpenayo Peak is a 6,231 ft summit in the Tatoosh Range which is a sub-range of the Cascade Range. It is located south of Mount Rainier within Mount Rainier National Park, in Lewis County of Washington state. The mountain is named for Wahpenayo, a native American chief who was the father-in-law of Indian Henry. Precipitation runoff on the south and east side of the peak drains into tributaries of the Cowlitz River, whereas the north side drains into tributaries of the Nisqually River.