| Hoar Oak Water | |
| Subdivision Type1: | Country |
| Subdivision Name1: | England |
| Subdivision Type2: | County |
| Subdivision Name2: | Somerset, Devon |
| Subdivision Type3: | Region |
| Subdivision Name3: | Exmoor |
| Source1: | Hoarok Hill |
| Source1 Location: | Somerset, England |
| Source1 Coordinates: | 51.1683°N -3.8031°W |
| Source1 Elevation: | 475feet |
| Mouth: | East Lyn River |
| Mouth Location: | Watersmeet, Devon, England |
| Mouth Coordinates: | 51.2233°N -3.7997°W |
Hoar Oak Water is a moorland tributary of the East Lyn River in Exmoor, Somerset, England.
It rises at Hoaroak Hill in the Chains geological site and flows to Watersmeet in the East Lyn Valley in Devon.[1]