Digby is a small village in the North Kesteven district of Lincolnshire, 6 miles N of Sleaford and 12 mile S of Lincoln city centre. The church is in the village centre and consists of a c. 1200 W tower with a late medieval top, a 13thc. nave with three-bay side aisles, and an additional W bay of similar date added to the N aisle. There is a 13thc. chancel, and a Perpendicular style clerestory. Restoration was carried out in 1881 by Charles Kirk included the rebuilding of the chancel. The S doorway is of the 12thc.

Digby was held by Toki son of Auti before the Conquest, and by Geoffrey Alselin in demesne in 1086. It was assessed at 12 carucates.

A great deal of red pigment traces remain on the doorway. The surface condition of the stone in the arch orders varies from the extremely worn, chipped, rugged surfaces of the E side, 1st order, 1st voussoir and the E side, 2nd order, 1st two voussoirs to the sharp edges and smooth surfaces of the rest of the arch. A similar distinction is found between the W and E imposts. It appears that the remains of good 12thc. material consist of the voussoirs just mentioned, the capitals, R nook-shaft base, and lower R section of the reveal.

The dedication of the church varies according to the source. The diocese calls it St Thomas of Canterbury, the List Description St Thomas a Becket, and Pevsner St Thomas Martyr. Arnold Forster claims that the medieval dedication was to St Thomas a Becket, but that was a Victorian formulation and cannot be true.