Loch Doire nam Mart, also known as Loch Durinemart or Loch Durinemast, is a small, lowland, freshwater loch on the Ardtornish Estate on the Morvern peninsula in the Scottish Highlands. It lies in a northwest to southeast direction approximately to the north west of Loch Aline. It is long and wide, and is at an altitude of . It drains into Loch Arienas which lies approximately to the southeast. The average depth is and its maximum depth is . The loch was surveyed on 18 August 1904 by James Murray as part of Sir John Murray's Bathymetrical Survey of Fresh-Water Lochs of Scotland 1897-1909.
The loch holds native wild brown trout and permits are required to fish the loch.