Mo is a village in Gjerstad Municipality, in Agder, Norway. Mo lies at 163 m above sea level, 12.5 km from the Scandinavian mountains. The nearest city is Porsgrunn/Skien, 44 km to the northeast. Among the landmarks around are Søndeled Church (11.5 km), Gjerstad Church (4.1 km) and Risør Church (18.3 km).