Cornish independence is a movement which seeks independence or greater autonomy for the area of Cornwall which advocates assert is not a county of England as is generally regarded, but a separate nation which has never been formally incorporated into England.
Advocates of Cornish independence question the legal legitimacy of English rule in Cornwall, although their claims are not generally recognised internationally or within the United Kingdom (or indeed within Cornwall itself).
The political party Mebyon Kernow is a key advocate of Cornish independence.