Smithborough or Smithboro (Irish: Na Mullaí) is a village in County Monaghan, Ireland. It is within the townlands of Mullaghduff and Mullaghbrack. It is roughly mid-way between Monaghan Town and Clones on the N54. Nearby villages within 6-7 km 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.