Thomas Charles Lethbridge, better known as T. C. Lethbridge, was an English archaeologist, parapsychologist, and explorer. A specialist in Anglo-Saxon archaeology, he was honorary Keeper of Anglo-Saxon Antiquities at the Cambridge University Museum of Archaeology and Ethnology from 1923 to 1957, and wrote twenty-four books on various subjects, becoming known for his advocacy of dowsing.
Born in Somerset to a wealthy family, Lethbridge was educated at Trinity College, Cambridge, during the course of which he attended an expedition to Jan Mayen island, becoming part of the first group to successfully climb the Beerenberg. After a failed second expedition to the Arctic Circle, he became involved in archaeology. In his capacity as Keeper of Anglo-Saxon Antiquities at the Cambridge University Museum of Archaeology and Ethnology, Lethbridge carried out excavations at sites around Britain. His claims regarding the existence of Iron Age hill figures on Wandlebury Hill in Cambridgeshire caused controversy within the archaeological community, with most archaeologists concluding that he had misidentified a natural feature.