Smithborough or Smithboro (Irish: Na Mullaí)[2] is a village in County Monaghan, Ireland.

It is roughly midway between Monaghan Town and Clones on the N54.

Nearby villages within 6–7 km (3 or 4 miles away) are Threemilehouse, Scotstown, Ballinode, and Newbliss all within County Monaghan and Roslea in County Fermanagh.

The local football team is Éire Óg, who wear blue with a gold band.

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