Fairweather Glacier, Tidewater glacier in Glacier Bay, United States.

Fairweather Glacier is a 19-mile (31 km) glacier in Glacier Bay National Park and Preserve, Alaska. It begins on the west slope of Mount Salisbury and runs west to a terminus mapped in 1961, 0.2 miles (300 m) east of Cape Fairweather, about 100 miles (161 km) northwest of Hoonah.

Fairweather Glacier begins on the west slope of Mount Salisbury and runs about 19 miles (31 km) west to a terminus recorded in 1961, roughly 0.2 miles (300 m) east of Cape Fairweather. That position lies about 100 miles (161 km) northwest of Hoonah, inside Glacier Bay National Park and Preserve. The Alaska Marine Highway later named its fast ferry MV Fairweather after the glacier.

The glacier's name comes from Cape Fairweather, the headland beside its 1961 terminus, which lies about 300 metres to the west. The Alaska Marine Highway later gave the name to the fast ferry MV Fairweather, so the glacier is also known through a vessel that crosses the region's waters.

Visiting requires planning ahead through licensed charter services or tour operators based in nearby coastal communities. The most practical way to see it is by water, as the glacier can best be viewed and approached from the sea.

The glacier's name was given to the MV Fairweather, a fast ferry of the Alaska Marine Highway. The glacier ends about 300 m east of Cape Fairweather, roughly 161 km northwest of Hoonah, and begins on the west slope of Mount Salisbury.