Cities of Hârn is a fantasy role-playing game supplement which contains seven reversible color and black-and-white city maps and very detailed accompanying background information for each of these seven Hârn cities. The supplement also provides detailed interior plans of various buildings, including temples, taverns, and arenas. The supplement can also be used a generic supplement for any campaign world.

The seven cities are: Aleath, Cherafir, Coranan, Golotha, Shiran, Tashal, and Thay.