Grendon Bishop is in NE Herefordshire and consists mainly of a few houses on the main road (A44) from Leominster to Bromyard and Worcester. The land here is hilly and wooded and given mainly to pasture. To the S it slopes down to the valley of the river Lodon, and the church is built here in the fields, half a mile from the main road and 300 yards from the former Grendon Manor, now a farmhouse. The area around the church is a suggested deserted medieval village, but there is no evidence for this apart from the church itself.

St John’s consists of a nave with a timber S porch, a polygonal apse and a W tower with a small broach spire. It was built in 1787-88, the old church having fallen down two years earlier. In 1869-70 the church was enlarged and the apse added to the designs of F. R. Kempson of Hereford. There is one plain 12thc window reused in the S wall of the W tower, and the font may also be Romanesque.

Eadwig and Ordric held Grendon before the Conquest as two manors. In 1086 it was held by William from Roger de Lacy, and consisted of four hides.

Pevsner (1963) ignores the font, and Brooks and Pevsner (2012) place it in the 12thc to 13thc. Marshall dates in in the late-12thc, followed by the Herefordshire SMR.