Careby Aunby and Holywell is a civil parish in the district of South Kesteven, south-west Lincolnshire, in England.

[4] The population in 1801 was 65, and had risen to 133 by 1911 The centre of the parish is near grid reference TF017157 Earthen banks forming the remains of a small moated medieval structure in the woods between Aunby and Holywell.

[5] At the western boundary with Rutland there is a small but important Nature Reserve called Robert's Field at Lincolnshire Gate.

[9] Download coordinates as: The parish's geology is a complex mixture of numerous strata of Jurassic rocks with the highest ground formed of glacial drift.

To the east and west of Careby are patches of chalky glacial till, the eastern one overlying a thin remnant of Kellways beds with cornbrash fairly extensively exposed to its south.