Ha-Iltzuk Icefield, Glacier in Coast Mountains, British Columbia, Canada.

The Ha-Iltzuk Icefield is an icefield in the central Pacific Ranges of the Coast Mountains in British Columbia, Canada. It covers 3,610 km2, the largest icefield in the Coast Mountains south of the Alaska Panhandle. Its southern half is the Silverthrone Glacier, which flows west into the Klinaklini Glacier; the northern half is the Klinaklini Glacier, whose northwest tongue feeds the Machmell River.

This glacier system was formed thousands of years ago through natural glacial processes. In recent decades, the glaciers have undergone significant changes that have visibly altered the landscape.

The name Ha-Iltzuk is almost certainly a phonetic spelling of hailtzaq, the Heiltsuk-language pronunciation of Heiltsuk. The name does not appear in government gazettes, so it is not an official toponym. The icefield lies in the territory of the Heiltsuk people.

The icefield lies west of the Klinaklini River and the Waddington Range, with no road access; approach is by air or long glacier travel. The Klinaklini Glacier drains northwest to form the Machmell River, while the Silverthrone Glacier joins the Klinaklini Glacier above its terminus. Travel requires glacier equipment and experienced route-finding.

Mount Silverthrone rises prominently from the northeast edge of the icefield and represents the highest point of this glacier system. This distinctive peak was formed above a caldera structure and serves as a visible landmark within the vast white landscape.