St Mary's on the Hill, 142 Carnmoney Rd, Newtownabbey, County Antrim, BT36 6JU

St Mary's on the Hill is a Roman Catholic church built in 1896 to designs by J. J. O'Shea, located on the west side of Carnmoney Road in an elevated hilltop setting. The building is constructed of random-coursed rock-faced basalt over a splayed red sandstone plinth, with a pitched natural slate roof and red clay fleur-de-lys ridge tiles.

The church is rectangular on plan, facing east with a diminished chancel to the west. It features a two-stage square tower to the south and a two-storey sacristy to the north elevation of the chancel. A modern porch has been added to the east elevation. The building displays Gothic detailing throughout, including moulded stone verges with wrought-iron Celtic crosses at the gable apexes, cavetto-moulded stone corbelled eaves, and half-round cast-iron gutters.

Windows are predominantly cusped stained glass lancets with dressed sandstone surrounds and splayed flush sills. Non-lancet windows feature Geometric tracery with figurehead label-ended hoodmoulds. The east gable contains two Gothic geometric-tracery windows with an apex ventilation lancet. The chancel gable has a full-height Gothic geometric-tracery window. The south elevation is abutted by the tower, which features a pyramidal slate roof, angle buttresses, and a Gothic varnished timber-sheeted double-leaf door with moulded stone surround, crocketed collonettes, and hoodmould, accessed by two stone steps. The tower's second stage has windows to both left and right cheeks.

The sacristy is detailed to match the church, with square-headed replacement timber casement windows in stop-end-chamfered dressed stone architraves. The sacristy gable has two diminished windows with wrought-iron protection grilles, and the north elevation contains three windows. To the right of the sacristy is a modern single-storey boiler block.

The church is situated on a tarmac parking lot with landscaped lawn, separated from the road by a modern mild steel railing over a random rubble stone plinth wall, and accessed via modern mild steel vehicular double gates.

The building was designed for Rev. J. Hamill, Parish Priest of Whitehouse, and first appears on the third edition Ordnance Survey map of 1902 marked as 'St Mary's on the Hill'. The site was previously recorded as 'site of RC Chapel' in exemptions on the Valuation Revision Map dating from 1885-1895.