The Columbia Icefield is an icefield located in the Canadian Rockies, astride the Continental Divide of North America. The icefield lies partly in the northwestern tip of Banff National Park and the southern end of Jasper National Park. It is about 325 km² in area, 100 to 365 metres (328 to 1,197 ft) in depth and receives up to seven metres (275 in) of snowfall per year. The icefield feeds eight major glaciers, including:
- Athabasca Glacier
- Castleguard Glacier
- Columbia Glacier
- Dome Glacier
- Stutfield Glacier
- Saskatchewan Glacier
Parts of the Icefield are visible from the Icefields Parkway. The Athabasca Glacier has receded significantly since its greatest modern-era extent in 1844. During the summer months visitors to the area can travel onto the glacier in the comfort of large "snowcoaches". The Columbia Icefield is also a major destination for ski mountaineering in the winter months.
The icefield was first reported in 1898 by J. Norman Collie and Hermann Woolley after they had completed the first ascent of Mount Athabasca.
The Athabasca River and the North Saskatchewan River originate in the Columbia Icefield, as do tributary headwaters of the Columbia River. As the icefield is atop a triple Continental Divide these waters flow ultimately north to the Arctic Ocean, east to Hudson Bay (and thence to the North Atlantic Ocean), and south and west to the Pacific Ocean. Hudson Bay, in some watershed divisions, is considered to be in the Arctic watershed, in which case this would arguably not be a triple continental divide point.