There have been two National Parties on the Isle of Man.
The first National Party was a party that identified itself with the UK Conservatives. They were active in the period between the world wars in opposing the activities of the Manx Labour Party. However, unlike the Labour Party, they were unsuccessful in establishing themselves over the longer term and they folded.
The second Manx National Party was an offshoot of the party, Mec Vannin, the nationalist party on the Isle of Man. Divisions within Mec Vannin caused the split in 1977, and the single Mec Vannin member of the House of Keys (Peter Craine ) transferred his loyalties to the new party. When Craine ceased to be a MHK in 1981 the Manx National Party soon ceased to exist.