Sir Cyril Fred Fox Kt FSA FBA MRIA (16 December 1882 – 15 January 1967) was an English archaeologist and museum director. Fox became keeper of archaeology at the National Museum of Wales, and subsequently served as director from 1926 to 1948. His most notable achievements were collaborative. With his second wife, Aileen Fox, he surveyed and excavated several prehistoric monuments in Wales. With Iorwerth Peate, he established the St Fagans National Museum of History, and with Lord Raglan, he authored a definitive history of vernacular architecture, Monmouthshire Houses.