Keisby is a hamlet in the civil parish of Lenton, Keisby and Osgodby, in the South Kesteven district, in Lincolnshire, England.

[1] Keisby comes from an Old Norse term meaning "Kisi's farmstead or village".

[2] The village is mentioned in the Domesday account,[3] and has had different spellings over the years, from Chisebi to Kisebi and Kysebi.

[2] The English surname Kisby (and variants) is believed to originate from Keisby.

[6] Keisby is part of the Lenton, Keisby and Osgodby ecclesiastical parish, and The North Beltisloe Group of parishes in the Deanery of Beltisloe.