Banff and Buchan was a constituency of the House of Commons, located in the north-east of Scotland within the Aberdeenshire council area.

Further to the completion of the 2023 Periodic Review of Westminster constituencies, the seat was subject to boundary changes which involved expansion into eastern parts of Moray.

[2] A mostly rural constituency, it took in the towns of Fraserburgh, Peterhead and Turriff, and the main industries are fishing and tourism.

[5] In 2010, Eilidh Whiteford succeeded Alex Salmond as the MP for Banff and Buchan, but the SNP vote share fell below 50% for the first time since 1992, due to a strong challenge by the Conservative Party.

2005–2024: The Aberdeenshire Council wards of Durn, Banff West and Boyndie, Banff, Aberchirder, Macduff, Gamrie King Edward, Buchan North, Fraserburgh West, Fraserburgh North, Fraserburgh East, Fraserburgh South, Buchan North East, South Buchan, Central Buchan, Lonmay and St Fergus, Mintlaw Old Deer, Mintlaw Longside, Boddam Inverugie, Blackhouse, Buchanhaven, Peterhead Central Roanheads, Clerkhill, Dales Towerhill, Cruden, Turriff West, Turriff East, Upper Ythan, and Fyvie Methlick.