Liam McArthur in the context of Scottish Liberal Democrats

Orkney is a county constituency of the Scottish Parliament covering the council area of Orkney. 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 eight constituencies in the Highlands and Islands electoral region, which elects seven additional members, in addition to the eight constituency MSPs, to produce a form of proportional representation for the region as a whole.

Orkney has been held by the Liberal Democrats at all elections since the formation of the Scottish Parliament in 1999, with the current MSP being Liam McArthur, who won the seat at the 2007 Scottish Parliament election. The former Deputy First Minister Jim Wallace represented the constituency from 1999 to 2007.