Polnessan (Scottish Gaelic: Poll an Easain, pool on the small waterfall) is a small rural village in East Ayrshire, Scotland. Polnessan has a population of 87, and is located one kilometre north of Patna on the A713 road.
Polnessan has no facilities, except for a play park which is due for upgrading, and is effectively a long row of council housing. The houses were originally built for miners and their families on the Houldsworth pit, a nearby coal mine.
There are bus services to Ayr and Dalmellington regularly from Polnessan, run by the Stagecoach bus company, as well as telephone and postal facilities.
Coordinates: 55°22′30″N 4°29′48″W / 55.3749°N 4.4967°W