Odell Lake is located near Willamette Pass in the northwest corner of Klamath County, Oregon, United States. It is one of several lakes in the Cascade Range in Central Oregon, and lies within the Deschutes National Forest. It was named for Oregon Surveyor General William Holman Odell by Byron J. Pengra, in July 1865, while they were making a preliminary survey for the Oregon Central Military Road, which would later become Oregon Route 58. The lake fills a basin carved by a glacier, and the resulting terminal moraine confines the water along the lake's southeast shore.