Siyeh Glacier is in Glacier National Park in the U.S. state of Montana. The glacier lies in a deep cirque to the north of Mount Siyeh at an elevation between 7,200 feet (2,200 m) and 6,800 feet (2,100 m) above sea level. Siyeh Glacier covers an area of less than 10 acres (0.040 km²) and does not meet the threshold of 25 acres (0.10 km²) often cited as being the minimum size to qualify as an active glacier.