Tullaghan (Irish: An Tulachán[3]) is the most northerly village in County Leitrim, Ireland.

Tullaghan includes a small section of County Sligo and extends east to the edge of Lough Melvin and the Garrison lowlands, west to Bunduff strand (in the north Sligo coastal area) and south to the northern slopes of the Dartry Mountains and the Arroo and Mountain Outliers.

The R280 road connects Tullaghan with the rest of County Leitrim.

Tullaghan has the single shortest bit of county coastline in Ireland – a mere 4.7 kilometres (2.9 mi) long.

[8] Back in 1925, Tullaghan village comprised 19 houses, 5 being licensed to sell alcohol.