Drumahaire (Irish: Dhroim Dhá Thiar) is a barony in County Leitrim, Ireland.

Drumahaire barony takes its name from the village of Dromahair (Irish: Dhroim Dhá Thiar, "Two Demons Ridge").

The Irish thiar is a shortening of eithiar, a term that refers to a spirit of the air.

O'Finn and O'Carroll were chiefs of Cálraighe, which included the civil parishes of Drumlease and Killargy.

The MacKenny's (Keaney) were chiefs in an area known as Muinter Mountains, or Muintir-Kenny, an older name for the barony of Dromohair.