The Scottish Parliament in Holyrood has 129 Members of the Scottish Parliament (MSPs). Of these, 73 are elected from constituencies and 56 from eight larger electoral regions, using the Additional Member System. Each voter has two votes: one for their local MSP, and one for a regional party list. This blended system is designed to produce more proportional outcomes than Westminster’s first-past-the-post method.

In May 2026, updated constituency and regional boundaries will be used for the first time.

Constituency changes include new names, adjusted boundaries, and some complete redesigns. Regional boundaries will also change, with the Central Scotland region being replaced by Central Scotland and Lothians West, and the Lothian region replaced by Edinburgh and Lothians East. These changes reflect population shifts and evolving electoral geography in Scotland.