The Callan River is a river in County Armagh, Northern Ireland. Rising near Tullnawood lake, it flows in a generally northerly direction, past Darkley, passing within a few miles of Keady town, through Tassagh and on to Armagh. It joins the River Blackwater 1.3 km (0.8 mi) downstream from Charlemont or 1.6 km (1 mi) upstream from Bond's Bridge. It is navigable by dinghy or canoe for 2 km (1.2 mi) to Fairlawn Bridge.