Corteo Peak is an mountain summit located on the eastern boundary line of North Cascades National Park in Washington state. It is situated west of Rainy Pass in the North Cascades Range. Remnants of the retreating Lewis Glacier hang on its north flank. The nearest higher peak is Black Peak, to the northwest. Corteo Peak and nearby Mount Benzarino were named by Forest Service surveyor, Lage Wernstedt, after Basque sheepherders he met near these two mountains.