Osceola Peak is an 8,587-foot mountain in the Okanogan Range of northern Washington, within the Pasayten Wilderness of the Okanogan–Wenatchee National Forest. Officially named in 1972, it ranks among the highest summits in both the range and the state, making it a notable destination for peak-baggers and wilderness climbers. The mountain has a steep north face and a scree-covered south slope that provides a nontechnical route. Its waters drain north to the Similkameen River tributaries and south to Eureka Creek in the Methow basin. Like much of the North Cascades, it was shaped by uplift, faulting, and repeated glaciation.