The B110 was a short road in west County Armagh. The road was originally unclassified but gained its number in the mid-1920s. However, it had been renumbered by the mid-1940s, becoming the B210 for no apparent reason.
The road started on the A28 to the east of Caledon and headed south, shortly going under the now-gone railway line from Armagh to Monaghan; although the bridge has gone the abutments remain. The road then passed to the west of Tynan before a right-left zigzag took the road slightly to the west. It wasn't long before journey's end was reached at a T-junction on the A3 in Middletown.