Loch of Houll is a loch on Whalsay, one of the Shetland islands of Scotland. It is located to the southeast of Brough and on the eastern side of Setter Hill. An eastern tributary of the Scarfmoor Burn passes into the western side of the loch.It is described as a "large shallow loch with brown trout averaging 8-10 oz and some over 2 lbs." On the western side of the loch is Peerie Roonie House, a ruined stone house, which still has traces of the inner face of a drystone wall and drain. Archaeologists excavating at the site discovered stone tools dated to the Neolithic period and peat ash.