Perthshire South and Kinross-shire is a county constituency of the Scottish Parliament covering part of the council area of Perth and Kinross. Under the additional-member electoral system used for elections to the Scottish Parliament, it elects one Member of the Scottish Parliament (MSP) by the plurality (first past the post) method of election. It is also one of nine constituencies in the Mid Scotland and Fife 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.
The seat has been held by Jim Fairlie of the Scottish National Party since the 2021 Scottish Parliament election.
The other eight constituencies of the Mid Scotland and Fife region are: Clackmannanshire and Dunblane, Cowdenbeath, Dunfermline, Fife North East, Kirkcaldy, Mid Fife and Glenrothes, Perthshire North and Stirling. The region covers all of the Clackmannanshire council area, all of the Fife council area, all of the Perth and Kinross council area and all of the Stirling council area.
The Perth and Kinross council area is represented in the Scottish Parliament by two constituencies, Perthshire North and Perthshire South and Kinross-shire, defined by the 2011 first periodic review of Scottish Parliament boundaries. Prior to this, Perth and Kinross was represented by four constituencies in the Scottish Parliament, which were used from the opening of the Parliament in 1999 until the 2011 Scottish Parliament election, these were: Angus, North Tayside, Perth and Ochil.
The electoral wards of Perth and Kinross Council used in the formation of Perthshire South and Kinross-shire are:
At the second periodic review of Scottish Parliament boundaries in 2025 the seat boundaries were ammended very slightly to reflect changes in the boundaries of the above wards, although the seat continues to be formed of the same wards as at the first periodic review.
The BBC provided the following profile of the constituency ahead of the 2016 Scottish Parliament election:
The Perthshire South and Kinross-shire constituency covers the southern half of the Perth and Kinross council area, forming its northern boundaries with the Perthshire North constituency following the River Almond and the River Tay east of Perth. The seat covers a majority of the city of Perth to the north-east, covering the western side of the city from Dunkeld Road and the railway line.
The following is the notional result for the 2007 Scottish Parliament election, as calculated by the BBC.