Before the Acts of Union 1707, the barons of the shire of Lanark elected commissioners to represent them in the unicameral Parliament of Scotland and in the Convention of the Estates. The number of commissioners was increased from two to four in 1690.
From 1708 Lanarkshire was represented by one Member of Parliament in the House of Commons of Great Britain.
List of shire commissioners Parliament or ConventionCommissionersParliament12–13 October 1612Sir William Baillie of LamingtonSir John Hamilton of LettrickConvention7 March 1617Maxwell of CalderwoodParliament27 May–28 June 1617Sir John Hamilton of LettrickMaxwell of CalderwoodConvention25–26 January 1621noneParliament1 June–4 August 1621Maxwell of CalderwoodSir John Hamilton of LettrickConvention27 October–2 November 1625Hamilton of LettrickHamilton of GoslingtounParliament15 September 1628 – 28 June 1633Sir James Lockhart, yr of LeeGavin Hamilton of RaplochConvention28 July–7 August 1630Gavin Hamilton of RaplochSir James Lockhart, yr of LeeParliament15 May 1639 – 17 November 1641Convention22 June 1643 – 3 June 1644Parliament4 June 1644 – 27 March 1647Parliament2 March 1648 – 6 June 1651During the Commonwealth of England, Scotland and Ireland, the sheriffdom of Lanark was represented by one Member of Parliament in the Protectorate Parliament at Westminster.Parliament3 September 1654 – 22 January 1655William LockhartParliament17 September 1656 – 4 February 1658Parliament27 January–22 April 1659After the Restoration, the Parliament of Scotland was again summoned to meet in Edinburgh.Parliament1 January 1661 – 9 October 1663Sir James Lockhart of LeeSir Robert Hamilton, 1st Baronet of SilvertonhillG. E. C., The Complete Baronetage, volume II (1902) page 454.Convention2–4 August 1665Gavin Hamilton of RoplochConvention9–23 January 1667Parliament19 October 1669 – 3 March 1674John Harper of CambusnethanSir William Lockhart (from 1672)Convention26 June–11 July 1678Cromwell Lockhart of LeeMaj. Sir Robert Hamilton, 2nd Baronet of SilvertonhillParliament28 July 1681 – 1 March 1682Sir George Lockhart of BraidwoodParliament23 April 1685 – 15 June 1686Sir George Lockhart, now of CarnwathCromwell Lockhart of LeeConvention14 March–24 May 1689William Baillie of LamingtonSir Daniel Carmichael of MaudslieParliament5 June 1689 – 30 June 1702By Act of Parliament 14 June 1690, the shire of Lanark was allocated two additional Commissioners.William Baillie of LamingtonSir Daniel Carmichael of MaudslieSir William Denham of WestshieldComplete Baronetage, volume IV (1904) p. 363.James Hamilton of AikenheadSir John Lockhart of Castlehill (from 1693)Richard Lockhart of Lee (from 1695)Sir William Stuart of CastlemilkComplete Baronetage, volume IV, p. 267. (from 1696)Parliament12 November 1702 – 25 March 1707George Baillie of JerviswoodJohn Sinclair, yr of StevensonComplete Baronetage, volume II, page 422.
See also List of constituencies in the Parliament of Scotland at the time of the Union
References Return of Members of Parliament, Part II (1879) pp. 550–600.