Ågelsjön, Lake in Östergötland County, Sweden.

Ågelsjön is a lake in Norrköping Municipality, about 10 km north of Norrköping. It covers 1.41 km², reaches a depth of 35.3 m and lies 67.7 m above sea level. The lake is part of the Ågelsjön nature reserve and a Natura 2000 site, drained by Hultån.

Ågelsjön lies in the Kilaån–Motala ström coastal catchment area and drains through Hultån, which reaches the sea after 6.4 km. SMHI groups the lake in the sub-catchment it calls Utloppet av Ågelsjön, whose mean elevation is 106 m and whose 9.74 km² are mostly forest, 84 percent. The lake sits 67.7 m above sea level, about ten kilometres north of Norrköping.

Ågelsjön lies within a nature reserve and Natura 2000 area protected under the Habitats and Birds Directives. The lake is a humus lake, rich in humic matter, which colours the water brown. Hultån drains it, and the surrounding forest covers 84 percent of its catchment.

Ågelsjön lies about 10 km north of Norrköping and is reached by road; the lake and its surroundings form the Ågelsjön nature reserve and a Natura 2000 site. Trails lead up the hillsides around the water, and climbing areas are on the rock faces. The water is humus-rich and dark.

Ågelsjön is a brown-water lake, rich in humus, which tints the water dark. It lies within the Ågelsjön nature reserve and the Natura 2000 network, protected under the EU habitat and bird directives. Hultån drains the lake toward the sea.