The N78 road is a national secondary road in Ireland. The  road links the N77 national secondary road north of Kilkenny, County Kilkenny to the M9 national primary route at Mullamast in County Kildare.
In Ireland, the N78 road serves as a national secondary route. It links the nearby N77 national secondary road, situated north of Kilkenny, County Kilkenny, with the major M9 national primary route located at Mullamast in County Kildare.