Loch Gruinart (Scottish Gaelic: Loch Gruinneard from the Old Norse, meaning "shallow fjord") is a sea loch on the northern coast of isle of Islay in Scotland. Land at the head of the loch, Gruinart Flats, is a designated nature reserve owned by the RSPB. It is an important winter roosting site for barnacle geese. Ardnave Point is a coastal promontory near the mouth of the loch on the northwest of Islay. The pìobaireachd Lament for Sir Lachlan Mor harks back to this battle which was also remembered in Islay folklore.