The River Add (Scottish Gaelic: Abhainn Àd) is a river which runs through Argyll and Bute on the West of Scotland. Historically, it was known as the river Airigh but to avoid confusion with the Aray (which gives its name to Inveraray), it was renamed the River Add. It is joined by a tributary from the Blackmill Loch, the Feorlin reservoir and Abhainn Bheag an Tunns just before skirting the northern side of (a much larger reservoir which feeds the lochgair power station.