The parish church of Hillingdon, dedicated to Saint John the Baptist, stands at the top of Hillingdon Hill at its junction with Royal Lane. It is built of flint with bath stone dressings and, like many old buildings, has been altered and enlarged over the centuries to meet the changing needs of the parish. The earliest written reference to a church in Hillingdon is the grant by Brian Fitz Count, lord of Colham manor, of Hillingdon church to Evesham Abbey shortly after 1100.
Nothing remains of that building.
The earliest part of the present building is acknowledged to be the chancel arch, dated around 1270. The western three bays of the nave and north and south aisles are dated mid 14th century, with the south aisle thought to be the earlier of the two aisles. It is embattled, of three stages, with a cupola containing a bell and topped by a weather vane. The cupola is made of oak and is supported on six octagonal columns. The tower contains a peal of ten bells.