Lituya Glacier, Tidewater glacier in Glacier Bay National Park, Alaska, United States

Lituya Glacier is a tidewater glacier inside Glacier Bay National Park and Preserve. Its source lies in the Fairweather Range, and it feeds into Lituya Bay on the Gulf of Alaska coast of Southeast Alaska. The glacier's movement and retreat carved Lituya Bay into a formation with steep walls, a very deep submerged bottom and a very narrow entrance.

The glacier was charted by Russian sea captains in the early 1800s and marked on nautical maps. Since its first documented observation, it has been retreating and is now an important site for researchers studying glacial movement.

The glacier gives its name to the M/V Lituya, a ferry of the Alaska Marine Highway system, so the name travels well beyond the bay. The Tlingit name of the bay itself is not documented in the sources, and no local traditions are recorded there.

Visitors can view the glacier from guided boat tours departing from Glacier Bay National Park, with better visibility during warmer months. Bring warm clothing and be prepared for changing weather and rough water conditions.

The 1958 megatsunami was set off when an earthquake on the fault beneath Lituya Bay shook loose rock and ice; the wave reached 1,889 feet up the opposite slope. The glacier's retreat had shaped the bay's steep walls, deep floor and narrow entrance, the conditions that made such a wave possible.