Holl Island (66°25′S110°25′E) is a rocky, triangular-shaped Antarctic island, 1.7 mi (2.7 km) long, marking the southwest end of the Windmill Islands. Mapped from aerial photographs taken by USN Operation Highjump, 1946–1947, and USN Operation Windmill, 1947-1948. Named by the US-ACAN for Lt. Richard C.