Ardentinny (Scottish Gaelic: Àird an t-Sionnaich or Àird an Teine) is a small village on the western shore of Loch Long, 14 miles (23 km) north of Dunoon in Argyll and Bute, Scotland.

On the opposite side of Loch Long is the village of Coulport, home of RNAD Coulport, the storage and loading base for the UK's Trident Nuclear Defence Force, part of the extensive His Majesties Naval Base Clyde.

The local economy is reliant on tourism and agriculture, with major employers being the hotel, the outdoor centre and the caravan park.

The school had been proposed for closure in 1987 and the case was covered by the Yorkshire Television documentary series First Tuesday.

[10] The village of Ardentinny is featured in Don Brown's historical fiction novel Destiny, the prequel to his Navy Justice Series.