Edinburgh Eastern, Musselburgh and Tranent is a burgh constituency of the Scottish Parliament covering parts of Edinburgh and East Lothian. Formed ahead of the 2026 Scottish Parliament election, it elects one Member of the Scottish Parliament (MSP) by the first past the post method of election. Under the additional-member electoral system used for elections to the Scottish Parliament, it is also one of nine constituencies in the Edinburgh and Lothians East electoral region, which elects seven additional members, in addition to the nine constituency MSPs, to produce a form of proportional representation for the region as a whole.