Bills Peak is a mountain summit located on the common border of Kittitas County with Chelan County in Washington state. It is the tenth-highest point in the Teanaway area of the Wenatchee Mountains. Bills Peak is situated west-northwest of Earl Peak, its nearest higher neighbor, on the boundary of the Alpine Lakes Wilderness, on land managed by Wenatchee National Forest. Precipitation runoff from the peak drains south into tributaries of the Teanaway River, or north into tributaries of Ingalls Creek which is part of the Wenatchee River drainage basin. The view from the summit of this peak showcases the impressive Mount Stuart and Stuart Range. Bills Peak was named after William Noble Bill Prater (1926-2010), a mountaineer and farmer from nearby Ellensburg.