Callan River is a river in County Armagh, Northern Ireland which joins the River Blackwater 1.6 km upstream from Bond's Bridge. It is navigable by dinghy or canoe for 2 km to Fairlawn Bridge. It flows in a generally northerly direction from Tullnawood lake, past Darkley, passing within a few miles of Keady town, through Tassagh and on to Armagh.