Kirkby Underwood is a village and civil parish in the South Kesteven district of Lincolnshire, England.

Kirkby Underwood Grade I listed Anglican church is dedicated to St. Mary and All Saints.

[4] In 1885 Kelly's Directory described the church as in Perpendicular style, with chancel, nave and south aisle, and a tower containing three bells.

[5] The ecclesiastical parish is part of The Ringstone in Aveland Group of the Deanery of Beltisloe, Diocese of Lincoln.

[6] Between the village and Hawthorpe is Callan's Lane Wood, run by the Forestry Commission.