Cornwall County may refer to:
Cornwall County, Province of New York, United States Cornwall County, Jamaica the former name of Cornwall Land District, Tasmania, Australia Cornwall (), England, UK; a county, and former countdom United Counties of Stormont, Dundas and Glengarry, Ontario, Canada; sometimes called "County of Cornwall" Cornouaille (), Brittany, France; a former sovereign county, also spelled as "Cornwall"
See also Duchy of Cornwall Count of Cornouaille (disambiguation) Cornwall Township (disambiguation) Cornwall (disambiguation) Kernow (disambiguation)