| West Unicorn Peak | |
| Elevation Ft: | 6840. |
| Prominence Ft: | 200. |
| Isolation Mi: | 0.17 |
| Range: | Tatoosh Range Cascades |
| Parent Peak: | Unicorn Peak |
| Country: | United States |
| State: | Washington |
| Region: | Lewis |
| Region Type: | County |
| Part Type: | Protected area |
| Part: | Mount Rainier National Park |
| Map: | Washington#USA |
| Label Position: | right |
| Coordinates: | 46.7442°N -121.7051°W |
| Topo: | USGS Tatoosh Lakes |
| Easiest Route: | Climbing |
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, 0.17miles to the east-northeast. Precipitation runoff and meltwater from the peak's small glacier, Unicorn Glacier, drain into tributaries of the Cowlitz River.
West Unicorn Peak is located in the marine west coast climate zone of western North America.[1] Most weather fronts originating in the Pacific Ocean travel northeast toward the Cascade Mountains. As fronts approach, they are forced upward by the peaks of the Cascade Range (orographic lift), causing them to drop their moisture in the form of rain or snow onto the Cascades. As a result, the west side of the Cascades experiences high precipitation, especially during the winter months in the form of snowfall.[1] Because of maritime influence, snow tends to be wet and heavy, resulting in avalanche danger.[1] During winter months, weather is usually cloudy, but due to high pressure systems over the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer.[1] Due to its temperate climate and proximity to the Pacific Ocean, areas west of the Cascade Crest very rarely experience temperatures below 0°F or above 80°F.[1]