Langnes Peninsula () is a narrow rocky peninsula of irregular shape, 9 nautical miles (17 km) long, being the northernmost of the three main peninsulas that comprise the Vestfold Hills. The name derives from "Langneset" (the long point), applied by the Lars Christensen Expedition (1936–37) which mapped the peninsula from aerial photographs.
This article incorporates public domain material from the United States Geological Survey document "Langnes Peninsula" (content from the Geographic Names Information System).