St Mary's is an active parish church in the Diocese of Blackburn and the archdeaconry of Lancaster.

[3] In 1868–1869 substantial repairs and restoration of the church's older features was undertaken by Lancaster architecture firm Paley and Austin; they renovated the roof (at which time the gabled dormers were possibly added), repaired window stonework and lowered the floor.

[6] St Mary's is constructed of sandstone rubble with gritstone dressings and has slate roofs.

The roof over the nave features three gabled dormers on the north and two on the south, each with four small semi-domed windows to provide illumination for the congregation.

[4] It has three-light belfry louvres that have Perpendicular style tracery and a rounded arched doorway.

[1] The Middleton Chapel is at the east end of the north aisle and has by wooden screens that date from the late 17th or 18th century.

[2][4] In the south aisle there is a stone baptismal font that is 1 foot 5 inches (0.43 m) tall and has a large square bowl.

'[3] The chalice is from 1746 and a paten is inscribed 'Presented to Goosnargh Church in memoriam Charles Osborne Gordon, vicar of the parish, who died Aug. 19, 1892.'

[3] Stained glass in the church includes work by Shrigley and Hunt, Harry Stammers and Heaton, Butler and Bayne.

[7] To the south of the church there is a sandstone sundial which has two circular steps with a pedestal shaped like a vase; there is plate attached which is dated July 1746 and bears the name of the Rev.