St Peter's has an aisled and clerestoreyed nave with three-bay N and south arcades. All the arches of both arcades are pointed with two deeply chamfered orders. These are probably 14thc., but the south arcade's cylindrical piers with moulded and nailhead capitals are 13thc. in date. The N arcade is entirely 14thc., except for one cylindrical pier with a green man capital, which is 12thc. This is the only Romanesque piece in the church. The nave has 14thc. N and S doorways, the S under a 14thc. porch. The chancel and its arch are 14thc., with some 14thc. glass in the south windows. The W tower is 14thc., with diagonal buttresses, reticulated bell-openings and a corbel table. The broach spire above has three rows of lucarnes.

Aldwincle St Peter (Eldewincle) was listed among the lands held by men of Peterborough abbey in 1086. It was held by Ferron at the king's command, against the abbot's will. No church was recorded.

Benefice of Aldwincle with Thorpe Achurch and Pilton with Wadenhoe and Stoke Doyle.

Similar green man capitals occur elsewhere in the county, at Isham and Pytchley. Pevsner dates them to the late 12thc.; a date in the 1170s or '80s is suggested here.