The Water of Aven (or A'an) (Scottish Gaelic: an t-Uisge Bàn) is a tributary of the Water of Feugh, itself the largest tributary of the River Dee, Aberdeenshire, Scotland. The Water of Aven rises at Loch Tennet, where the historic counties of Aberdeenshire, Angus and Kincardineshire meet and flows for approximately 15 km to its confluence with the Feugh near Whitestone.