St Michael and All Angels is believed to have been built in the late 13th century on the site of an earlier church.

The building is in the traditional form of a cross, having north and south transepts.  

The Church was extensively restored in 1855, along with the other churches on his estate, by John Frederick Campbell, first Earl of Cawdor, the local landowner at the time, then living at Stackpole Court.  St Michael’s high-backed pews have disappeared and its Norman windows have been replaced by those of Gothic design. The Cawdor arms may be seen in the tiling of the Chancel and Sanctuary floor.

Medieval features include a Norman font, now lead-lined and covered with an oak lid, and a stone tomb under the south transept.

The transept windows have four lights and were erected in memory of another incumbent of Bosherston, The Ven David Edward Williams (1913-1920) who was Archdeacon of St Davids (1900-1920). It is interesting to note the choice of lights, in the south transept they depict St Teilo, the Rector’s favourite saint and St Govan, the local saint, surmounted by the Arms of Exeter College Oxford, where the Rector was educated. The north transept lights show St Michael, the dedication of the Church and St David. the Diocesan patron saint, surmounted by the Arms of St David and the Diocese of St Davids.

The Squint and west windows were erected by a schoolmistress who taught for many years in Bosherston School (now the Church Hall).  The squint window depicts St Nicholas as the patron saint of sea-farers and is in memory of Petty Officer George Evans, her husband, who was killed in the battle of Jutland. The west window is a depiction of Jesus. The Resurrection and the Life was erected in memory of her father, James Walter Davies of Pembroke Dock.

The east window has nine lights and depicts the Annunciation, the Nativity, the Baptism, the Agony in the Garden, the Crucifixion, the Burial, the Resurrection, the Ascension and Pentecost. It was erected in memory of the Revd William Allen, Rector between 1831 and 1872. William’s wife, Francis, wrote a diary covering the period from 1832 to 1865 and it provides a fascinating insight of country clergy life in South Pembrokeshire in the early 19th century.

Beneath the north transept window there is what is thought to be the tomb of a Dowager Duchess of Buckingham, an antecedent of the Duke of Norfolk. The fact that she was a widow may be gathered from the veil and cloak shown on the figure carved on the tomb. That she was of noble birth can be seen by the coronet on her head and the dog at her feet.

Under the south transept window there is a stone tomb surmounted by a figure depicting a Crusader.  It is thought to have been carved in the 14th century.

On the north wall of the church are brass tablets commemorating men of the Parish who lost their lives in the First World War and a coastguard killed on duty in the Second.

On the Nave walls are two stone tablets placed in memory of local families and near the organ there is a framed vellum inscription stating that when electricity was installed in the Church in 1958 each light was dedicated in memory of some local individual. The Church was rewired and new lighting installed in 1987.

Outside the church, erected on a two-tier throne, is an unusual Preaching Cross – unusual in that it has an unnaturally short upright and that it has a face carved on the centre of the cross. It has been suggested that originally there was a full stone crucifix which was mutilated and partly destroyed, perhaps during the Reformation, and that local folk found the cross but being unable to find its stem placed the cross on a simple upright of locally-hewn stone and erected it to serve as a Preaching Cross.

The Church was completely re-roofed in 1991-1992.

About a mile to the south of Bosherston there is the picturesque old chapel associated with St Govan. It is at least as old as the 11th century and may well be as old as the 6th century.