Girton Church probably dates from Saxon times. The earliest artifact in the present church is a Saxon altar-stone (discovered in the churchyard in 1951). The Church's history starts in 992 AD with the gift of a manor in Girton of about 500 hectares to Ramsey Abbey. If a church already existed, it was probably of timber and thatch construction, on the site of the present-day church. If not, it is probable that the Abbey would have built a church on this site soon after becoming Lord of the Manor.

The first official reference to a church in Girton comes in a Papal Bull of 1178 which validates the rights of Ramsey abbey to 'Girton with its church and all its appurtenances.' It was known as St Andrew's by 1240.

During the Middle Ages, there were five Girton guilds - fraternities of lay folk under the patronage of particular saints who organized welfare for the poorer members of the community, as well as funerals and feast days. These trade guilds undertook performances of plays, especially after the establishment of the Corpus Christi festival in 1311, a feast set apart especially for the performance of these pieces. As well as the major church festivals, there were twenty or thirty other feasts which they would have observed with services and processions. These guilds were craft-based, banding together master craftsmen, journeymen, apprentices and the various trades connected with a particular craft. Many guilds maintained some form of insurance for members, the elderly and widows. Until 1530, the guilds frequently received legacies, often of barley. By 1515 Girton had five guilds, each represented by individual colours: Trinity (gold), Corpus Christi (multi-coloured), St Mary (blue/white), St Nicholas (red), and All Saints (white).

A royal coat of arms can be seen above the archway to the chancel. This indicates that the Parish benefice was not from a local patron, but from the Lord Chancellor in London.

http://www.girton-cambs.org.uk/churches/StAndrews/history.html