In the centre of the village, within the conservation area, stands the church of St Gregory.

Barnham used to have two churches.  Barnham St Martin is now an ivy-clad ruin in the garden of a private house.  The two churches were consolidated in 1639 and St Martin's bells were sold off in 1682.

St Gregory's is built of flint, with stone dressings with a steeply pitched roof.  The basic structure dates from the 13th century, with the tower a 14th century addition.  In the 1860's the interior was refitted by the Duke of Grafton and the north aisle added. 

There are regular services, and the churchyard is still in use for burials.