| River Ayr | |
|---|---|
 The River Ayr Looking towards Alder Glen, from the River Ayr Way. | |
 | |
| Native name | Uisge Àir (Scottish Gaelic) |
| Location | |
| Country | Scotland |
| Counties | Ayrshire |
| Settlements | Ayr, Catrine, Muirkirk |
| Physical characteristics | |
| Source | Glenbuck Loch |
| • location | Muirkirk, Scotland |
| Mouth | Ayr Harbour, Firth of Clyde |
• location | Ayr, Scotland |
| Length | 65 km (40 mi) |
| Discharge | |
| • location | Lugar Water |
| Basin features | |
| Tributaries | |
| • left | Lugar Water, Garpel Water |
| • right | Greenock Water |
The River Ayr (pronounced like air, Uisge Àir in Gaelic) is a river in Ayrshire, Scotland. At 65 km (40 mi) it is the longest river in the county.
The river was held as sacred by pre-Christian cultures. The remains of several prehistoric sacrificial horse burials have been found along its banks, mainly concentrated around the town of Ayr.