Threemilehouse or Three Mile House (Irish: Teach na dTrí Mhíle)[1] is a village in County Monaghan, Republic of Ireland.

It lies[2] mostly within the townlands of Cabragh, Drumguill and Kilnaclay in the parish of Kilmore & Drumsnat.

The Central Statistics Office's report for the 2006 census lists Cabragh as a settlement with a total population of 167.

Drumsnat (Drom Sneachta) means the ‘Ridge of Snow’ and, according to tradition, this hill was covered by a mid summer snowfall in answer to the saint’s prayers for a site for a church.

The Church of Ireland cemetery also marks the last resting place of Emily and Mary Wilde, the half-sisters of Oscar Wilde, who died following a fire at the nearby Drumaconnor House in 1871 [4][5] Threemilehouse has a Gaelic Athletic Association (GAA) football club, Sean McDermotts,[6] who wear yellow and white.