Coordinates: 53°16′09″N 0°09′11″E / 53.269260°N 0.153055°E
Ailby is a hamlet in the East Lindsey district of Lincolnshire, England. It is situated less than 1 mile (1.6 km) north-west from Alford, and forms part of the civil parish of Rigsby with Ailby. The village does not possess a place name sign, and its only service is a small garden centre and a livery yard.
The ecclessiastical parish is Rigsby with Ailsby, part of the Alford Group of the Deanery of Calcewaithe & Candleshoe. The parish church is St James at Rigsby.
The village is mentioned in the 1086 Domesday Book as "Halebi", consisting of 8 households.
The hamlet appears to be the Deserted Medieval Village of Ailby, located to the south of the present Ailby Hall Farm.