West Unicorn Peak is the second highest point 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 nearest higher peak is Unicorn Peak, to the east-northeast. Precipitation runoff and meltwater from the peak's small glacier, Unicorn Glacier, drain into tributaries of the Cowlitz River.