Ayr was a county constituency of the House of Commons of the Parliament of the United Kingdom from 1950 to 2005. It elected one Member of Parliament (MP) by the first-past-the-post system of election.

Ayr is a town situated on the southwest coast of Scotland. A former royal burgh, today it is the administrative centre of the South Ayrshire Council, and the historic county town of Ayrshire. With a population of 46,982, Ayr is the 15th largest settlement in Scotland and second largest town in Ayrshire by population. The town is contiguous with the smaller town of Prestwick to the north. Ayr submitted unsuccessful bids for city status in 2000 and 2002, and as part of the wider South Ayrshire area in 2022.