River Shira (Scottish Gaelic: Siara / Abhainn Siara) is the river that runs for about 7 miles through Glen Shira, in Argyll and Bute, west of Scotland.

Originating to the north-east at 350 metres (1,150 ft) altitude, near the start of the River Fyne.

The river runs into the Lochan Shira reservoir, feeding the 5 MW Sron Mor (Big Nose), Shira Hydro-Electric Scheme, at 340 metres (1,120 ft) altitude and dropping 49 metres (161 ft).

The River Shira flows into Loch Dubh (Black Lake), where the Ancient Clan MacNaghten castle and crannogs used to be situated, then passes Stuart Liddell's house.

This article related to a river in Scotland is a stub.