Shenington is in NE Oxfordshire, 5.5 miles NW of Banbury. Holy Trinity church stands on a hill looking across to its sister church of St Michael at Alkerton. There is evidence of its existence here from the early 12thc. Made of the local Hornton ironstone, it comprises a chancel, nave, S aisle and W tower. From the exterior it is now entirely Decorated and Perpendicular, but it retains its original Romanesque chancel arch, with chevron and cable mouldings. When the church was restored by J.L. Pearson in 1879, the chancel arch was moved to a position in the N wall, separating the organ chamber from the chancel.

A church was in existence here in the first quarter of the 12thc. when Robert Sor gave the advowson to Tewkesbury Abbey. It has since been shuffled between the dioceses of Worcestershire and Gloucestershire, until it was finally allotted to Oxfordshire in 1900. It now belongs to the Ironstone Benefice, comprising Alkerton, Balscote, Drayton, Hanwell, Horley, Hornton, Shenington and Wroxton.

On the transposed chancel arch, the counter-directional cable on some stones of the hood is similar to the cable on the hood over the chancel arch at the old church of St Nicholas at Heythrop, near Chipping Norton, Oxfordshire. This is not a common motif.

A drawing by J.C. Buckler in 1823 shows a Romanesque font in the nave. It appears that for several years in the 19thc. it must have co-existed with a later new one, made before 1821, that was subsequently moved from the chancel to the W end of the S aisle to replace it (VCH).