Nicholson Rock () is a rock 2.5 nautical miles (4.6 km) east of Cox Bluff on the mainly snow-covered Spitz Ridge in eastern Toney Mountain massif, Marie Byrd Land. Mapped by United States Geological Survey (USGS) from surveys and U.S. Navy air photos, 1959-66. Named by Advisory Committee on Antarctic Names (US-ACAN) for Charles E. Nicholson, CE2, U.S. Navy, Construction Electrician at South Pole Station, 1974.