Gislev is an urban Settlement in Faaborg-Midtfyn Municipality, in the region of Southern Denmark, Denmark. Gislev lies at 85 m above sea level. It has 1,245 inhabitants (2026). The nearest city is Svendborg, 17.7 km to the south. Among the landmarks around are Egeskov Castle (8.3 km), Nonnebakken (24 km) and Viking Age Ring Fortresses (24 km). Among the natural features are Frederiksø (17.7 km) and Tornø (28 km).