Ayrshire (Parliament of Scotland constituency)

Before the Acts of Union 1707, the barons of the sheriffdom or shire of Ayr elected commissioners to represent them in the Parliament of Scotland and in the Convention of the Estates. The number of commissioners was increased from two to four in 1690.
After the Union, Ayrshire returned one Member of Parliament to the House of Commons of Great Britain and later to the House of Commons of the United Kingdom.