River Shira

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 .

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 includes a few waterfalls and islands, including Eilean an Eagail (The Island of Fear).

The River Shira flows into (Black Lake), where the Ancient Clan MacNaghten castle and crannogs used to be situated, then passes Stuart Liddell's house. Loch Dubh drains through the short (), then flows under the into Loch Fyne, a sea loch.Gearr Abhainn

The river lends its name to the ferry MV Loch Shira.