Lucas Glacier, Glacial formation in South Georgia, British Overseas Territory.

Lucas Glacier is an ice formation on South Georgia, a British island in the South Atlantic. The glacier stretches across mountainous terrain and forms part of the extensive ice coverage that characterizes the island.

Lucas Glacier was charted in 1912–13 by American ornithologist Robert Cushman Murphy, who visited South Georgia aboard the brig Daisy. He named it for Frederic Augustus Lucas, then director of the American Museum of Natural History. The glacier flows into Ample Bay and marks the east side of Salisbury Plain, opposite Grace Glacier, which Murphy named for his wife.

Lucas Glacier marks the east side of Salisbury Plain, where it flows into Ample Bay beside Grace Glacier. Robert Cushman Murphy charted it in 1912–13 from the brig Daisy and named it for Frederic Augustus Lucas, then director of the American Museum of Natural History. The name was later approved for the feature on British charts.

Access is only by ship, since South Georgia has no airport facility. Visitors must follow strict environmental protection guidelines to preserve this sensitive habitat.

Lucas Glacier marks the east side of Salisbury Plain in the Bay of Isles, while Grace Glacier marks the west. Robert Cushman Murphy charted it in 1912–13 from the brig Daisy and named it for Frederic Augustus Lucas, then director of the American Museum of Natural History. The bay's features were named after expedition members, ships and birds.