Thoresway is a village in the West Lindsey district of Lincolnshire, consisting of a few houses, the church and farm buildings extending along a minor road to the SE of Caistor. St Mary's is a coursed ironstone rubble building with limestone dressings and consists of nave with late-13thc. arcades, a N porch, vestry and a chancel. It was rebuilt in 1879-80 by James Fowler, who added a W bell turret with a shirt spire over the W gable. The was formerly a 12thc. tower to the W of the present nave, and the E tower arch remains inside the church. Romanesque features are the N nave doorway and the W tower arch.

The main holding in Thoresway was held by Rolf and Koddi in 1066 and consisted of 5 carucates and 7 bovates of ploughland. In 1086 this was held by Alvred of Lincoln as tenant-in-chief. In 1066 Grimbald had a smaller holding of 2 bovates, held in 1086 by Odo from Ivo Taillebois.

The larger manor passed from Alvred to Alan of Lincoln, and later by marriage of his daughter to Ralf Bayous formed part of the Bayeux or Baiocis fee in Lincolnshire. In 1252, a market was granted to Elias de Rabayne.