| Official Name: | Tamnaherin |
| Irish Name: | Tamhnach Caorthainn |
| Map Type: | Northern Ireland |
| Coordinates: | 54.982°N -7.203°W |
| Country: | Northern Ireland |
| Postcode Area: | BT |
| Postcode District: | BT |
| Dial Code: | 028, +44 28 |
Tamnaherin (possibly from the ga|Tamhnach Caorthainn or 'field of the blackthorns')[1] is a townland and small housing estate in County Londonderry, Northern Ireland. In the 2001 Census it had a population of 123 people. It is situated within Derry and Strabane district.
In the early 19th century, Tamnaherin simply consisted of a few scattered rural properties. The relatively recent addition in the 1970s of a Roman Catholic church saw the building of several more properties. Development over the last few years, however, has seen the hamlet grow quite significantly due to the addition of a small housing estate.