The church is in the Diocese of Lincoln in the Deanery of Elloe West.

St Guthlac's is a member of the Deepings Churches Together, a local organisation of churches within The Deepings, and a member of the St Guthlac fellowship.

On the south face of the tower is a limestone sundial inscribed with "The day is thine", with a similar sundial on the north face which bears the words "The Night cometh".

The stained glass windows in the chancel depict scenes of the life of the St Guthlac, including one in which he is seen sailing through what is now the fens to establish a monastery, now Crowland Abbey.

Media related to Saint Guthlac, Market Deeping at Wikimedia Commons