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Coordinates: 52°34′34″N 0°21′11″W / 52.576°N 0.353°W
Ailsworth or Ailesworth is a village and civil parish in the City of Peterborough unitary authority, about 4.5 miles (7.2 km) west of the city centre. The parish is part of the former Soke of Peterborough, which was considered part of Northamptonshire but was more recently part of Cambridgeshire.
The village's toponym comes from the Old English Ægeleswurth. The Domesday Book of 1086 records it as Eglesworde.
The common lands of Ailsworth and the neighbouring parish of Castor were not enclosed until 1898.