The Cornish Nationalist Party (CNP) is a pro-secession political party that split from Mebyon Kernow on May 28, 1975. The CNP works to preserve the identity of Cornwall and improve its economy, and encourages links with Cornish people overseas and with other regions which have distinct identities. It also gives support to Unified Cornish, the language of the Cornish revival in modern times, and commemorates Thomas Flamank, a leader of the Cornish Rebellion in 1497, at an annual ceremony at Bodmin on 27th June each year.

The CNP publishes a quarterly journal, The Cornish Banner (An Baner Kernewek).