Pladda (Scottish Gaelic: Pladaigh) is an uninhabited island 1 km (0.62 mi) off the south coast of the Isle of Arran in the Firth of Clyde at grid reference NS027191, western Scotland.

The island is privately owned, having been put up for sale by Arran Estate in 1990.

Unusually for such a small island, it has its own source of fresh water.

John of Fordun and other chroniclers from 1400 to 1500 speak of the isle of St Blase of Pladda.

They were also filming locations for "Queen Victoria Syndrome", the first episode of season 5 of The Crown.