Abildsø is a neighborhood in the borough Østensjø in Oslo, Norway. It is located south of Manglerud and Ryen, east of Lambertseter, north of Langerud and east of Bøler the lake Østensjøvannet.
The neighborhood is named after the old farm Abildsø (Norse Apaldasvin). The first element is the genitive case of apaldr m 'wild apple tree', the last element is vin f 'meadow'.