Penwith is an area of Cornwall, England, located on the peninsula of the same name. It is also the name of a former local government district, whose council was based in Penzance. The area is named after one of the ancient administrative hundreds of Cornwall which derives from two Cornish words, penn meaning 'headland' and wydh meaning 'at the end'.

Cornish is a Southwestern Brittonic language of the Celtic language family. Along with Welsh and Breton, Cornish is descended from the Common Brittonic language spoken throughout much of Great Britain before the English language came to dominate. For centuries, until it was pushed westwards by English, it was the main language of Cornwall, maintaining close links with its sister language Breton, with which it was mutually intelligible, perhaps even as long as Cornish continued to be spoken as a vernacular. Cornish continued to function as a common community language in parts of Cornwall until the mid 18th century, and there is some evidence for traditional speakers of the language persisting into the 19th century.