| Fail Loch | |
|---|---|
 The site of Fail Loch | |
  Fail Loch | |
| Location | Tarbolton, South Ayrshire, Scotland |
| Coordinates | 55°31′53.8″N 4°29′42.5″W / 55.531611°N 4.495139°W |
| Type | Drained freshwater loch |
| Primary inflows | Townend Burn and the Mill Burn |
| Primary outflows | Water of Fail |
| Basin countries | Scotland |
| Islands | One |
| Settlements | Tarbolton |
Fail Loch or Faile Loch was situated in a low-lying area near the old monastery of Fail in the Parish of Tarbolton, South Ayrshire, Scotland. The old Lochlea Loch lies nearby and its waters still feed into Fail Loch via the Mill Burn.