Coordinates: 55°27′29″N 4°37′44″W / 55.458°N 4.629°W / 55.458; -4.629

Ayr (Scottish Gaelic: Inbhir Àir Mouth of the River Ayr) is a town and port situated on the Firth of Clyde in south-west Scotland. With a population of around 46,000, Ayr is the largest settlement in Ayrshire, of which it is the county town, and has held royal burgh status since 1205. Ayr is the administrative centre of the South Ayrshire council area, which is the unitary local authority.

To the north of Ayr is the adjoining town of Prestwick, famous for its golf and its aviation industry as home of Glasgow Prestwick International Airport. Other neighbouring settlements include Alloway, known for its associations with the poet Robert Burns.

In 2002, Ayr was one of four Scottish towns competing for city status to mark Queen Elizabeth II's Golden Jubilee, losing out to Stirling.

On April 26, 1315, the first Parliament of Scotland was held in Ayr by Robert The Bruce at St.John's Tower by the sea. It was once known as 'Inverair/Inverayr' and this usage is still retained in the Scottish Gaelic form of the name Inbhir Air.