American Border Peak is a mountain just south of the Canada-United States border, in the North Cascades of Washington state, with a corresponding sister peak, Canadian Border Peak, just north along a col connecting to it across the border. It is located within the Mount Baker Wilderness, part of the Mount Baker-Snoqualmie National Forest, near North Cascades National Park. It is notable for its large, steep local relief; however its somewhat rotten rock makes it less appealing to climbers than nearby Slesse Mountain.