Midlothian South, Tweeddale and Lauderdale

Midlothian South, Tweeddale and Lauderdale is a county constituency of the Scottish Parliament covering parts of the council areas of Midlothian and Scottish Borders. Under the additional-member electoral system used for elections to the Scottish Parliament, it elects one Member of the Scottish Parliament (MSP) by the first past the post method of election. It is also one of ten constituencies in the South Scotland electoral region, which elects seven additional members, in addition to the ten constituency MSPs, to produce a form of proportional representation for the region as a whole.

Created for the 2011 election, the constituency covers parts of the former constituencies of Midlothian and Tweeddale, Ettrick and Lauderdale. The remainder of Midlothian council area lies within the constituency of Midlothian North, whilst the remainder of Scottish Borders forms the Ettrick, Roxburgh and Berwickshire constituency.