Loch an Nostarie is an irregular shaped shallow freshwater loch that lies about a mile north of the west-end of Loch Morar and about a mile south-east of Mallaig in the Lochaber district of Scotland. Loch an Nostarie drains through the little lochan Loch a' Mheadhoin through lochan Loch a' Bhada Dharaich flowing south along Allt an Lóin stream into Loch Morar. Directly to the south of the loch is Loch a' Ghille Ghobaich.