A long, cruciform church of ca1300, although the north transept has been demolished.
Much restoration has been carried out on the building, most recently in 1959-60 by John Seely, Lord Mottistone.
The large geometric windows cannot be relied upon and may have once been foliated.
The south doorway and porch is in a good state, as is the West tower.

The tower has two-light Y-traced bell-openings supported by circular mullions, well preserved shafting on the interior windows with capitals, both carved and plain, and also a number of small exterior head-stops.
It contains a ring of eight bells, comprising six bells cast by Henry Bagley II of Chacombe in 1702, with the heaviest bell (tenor) weighing 1,600 pounds (730 kg) and two lighter bells cast by the Whitechapel Bell Foundry in 1995.

The two east windows, glazed with coloured panes, are believed to be Georgian in origin, being referred to as 'recent' additions in documents dating from 1849.
The nave roof has a ceiling, the painted imitation-plasterwork in the covings being of interest, believed to be 18th century work.
During the last restoration, the plaster ceilings in the chancel and the remaining south transept were removed, exposing roof timbers from the 15th century.

There is a reredos and communion table by Lord Mottistone in the Wrenian style.
These are placed halfway along the chancel so that a vestry is formed behind.
A wooden font and cover dates from the 18th century and is kept at Cottesbrooke Hall and may be viewed by appointment.
The church has one of few examples of a three-tier Georgian pulpit in the county and country, and is fitted with fine box pews.
There is a staircase with balusters leading to the Squire's pew in the south transept of similar date.
There is a small 'squint', with delicately carved hoodmoulding, in the junction between the chancel and the south transept.
The church plate, consisting of a Cup and Paten from 1635 and also two Flagons and a Breadholder of 1665, is held at Cottesbrooke Hall.

A number of large monuments include John Rede, d.1604 in the south chapel is of alabaster stone with a recumbent effigy in marble on a partially rolled mat.
A flat arch spans two columns, with a large cartouche beneath.
On the ground are the figures of 10 kneeling infants.
Sir John Langham, (d.1671) and his wife's monument is also in the south chapel.
It is free-standing in grey and white marble with good cartouches on the tomb-chest.
There are two recumbent effigies with much carving.
The monument cost £290 in 1676 and is by Thomas Cartwright Senior.

Other Langham family monuments are: Mrs. Mary Langham, d.1773, in the chancel with a classical urn by Moore; Sir James, d.1795, with a long inscription and standing female figure beside an urn; Lady Langham, d.1807, with a figure of Faith standing by Bacon Junior; Marianne, d.1809, the memorial made in 1810, a simple a draped urn, by Bacon Junior; Lady Langham, d.1810, with  number of columns and a depiction of the rock of Golgotha; Sir William, d.1812, a free-standing monument in the nave of Coade stone, by Bacon Junior.
A long, cruciform church of ca1300, although the north transept has been demolished. Much restoration has been carried out on the building, most recently in 1959-60 by John Seely, Lord Mottistone. The large geometric windows cannot be relied upon and may have once been foliated. The south doorway and porch is in a good state, as is the West tower.
The tower has two-light Y-traced bell-openings supported by circular mullions, well preserved shafting on the interior windows with capitals, both carved and plain, and also a number of small exterior head-stops. It contains a ring of eight bells, comprising six bells cast by Henry Bagley II of Chacombe in 1702, with the heaviest bell (tenor) weighing 1,600 pounds (730 kg) and two lighter bells cast by the Whitechapel Bell Foundry in 1995.
The two east windows, glazed with coloured panes, are believed to be Georgian in origin, being referred to as 'recent' additions in documents dating from 1849. The nave roof has a ceiling, the painted imitation-plasterwork in the covings being of interest, believed to be 18th century work. During the last restoration, the plaster ceilings in the chancel and the remaining south transept were removed, exposing roof timbers from the 15th century.
There is a reredos and communion table by Lord Mottistone in the Wrenian style. These are placed halfway along the chancel so that a vestry is formed behind. A wooden font and cover dates from the 18th century and is kept at Cottesbrooke Hall and may be viewed by appointment. The church has one of few examples of a three-tier Georgian pulpit in the county and country, and is fitted with fine box pews. There is a staircase with balusters leading to the Squire's pew in the south transept of similar date. There is a small 'squint', with delicately carved hoodmoulding, in the junction between the chancel and the south transept. The church plate, consisting of a Cup and Paten from 1635 and also two Flagons and a Breadholder of 1665, is held at Cottesbrooke Hall.
A number of large monuments include John Rede, d.1604 in the south chapel is of alabaster stone with a recumbent effigy in marble on a partially rolled mat. A flat arch spans two columns, with a large cartouche beneath. On the ground are the figures of 10 kneeling infants. Sir John Langham, (d.1671) and his wife's monument is also in the south chapel. It is free-standing in grey and white marble with good cartouches on the tomb-chest. There are two recumbent effigies with much carving. The monument cost £290 in 1676 and is by Thomas Cartwright Senior.
Other Langham family monuments are: Mrs. Mary Langham, d.1773, in the chancel with a classical urn by Moore; Sir James, d.1795, with a long inscription and standing female figure beside an urn; Lady Langham, d.1807, with a figure of Faith standing by Bacon Junior; Marianne, d.1809, the memorial made in 1810, a simple a draped urn, by Bacon Junior; Lady Langham, d.1810, with  number of columns and a depiction of the rock of Golgotha; Sir William, d.1812, a free-standing monument in the nave of Coade stone, by Bacon Junior.
Cottesbrooke