Zigzag Glacier is an alpine glacier located on the upper southwest slopes of Mount Hood in the U.S. state of Oregon. It ranges in elevation from 10,200 to 7,200 feet (3,100 to 2,200 m) with fingers in canyons extending to about 6,400 feet (2,000 m), and lies almost entirely within Mount Hood Wilderness. The upper extent is divided from Reid Glacier by Illumination Rock.