Tamnaherin (possibly from the Irish: Tamhnach Caorthainn or 'field of the blackthorns')[1] is a townland and small housing estate in County Londonderry, Northern Ireland.

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.

This article related to the geography of County Londonderry, Northern Ireland is a stub.