The Church of Scotland is the national church in Scotland, established by Act of the Scottish Parliament in 1560 Scotland is divided into units called parishes, which cover the whole of the country. There is a parish church in every parish offering Christian ministry to the whole population.

KILCHOMAN PARISH is an ancient parish, named after the Celtic saint Coman who established a church in the north east of the parish. There is a fine Celtic standing cross and a ruined church on the site. In 1899 a new church was built between Port Charlotte and Bruichladdich villages. It is built in the Norman style, to a plan of the famous architect Peter McGregor Chalmers. This church, St Kiarans, is now the parish church. Kilchoman was linked with Portnahaven parish in 1962, and further linked with Kilmeny in 2006.

KILMENY PARISH is an ancient parish, the present church having been built in 1828 when Parliament voted funds to build new churches in Scotland. It was built to plans of Thomas Telford and adapted by the heritor Walter F. Campbell. Its medieval predecessor lies 400m distant within the old graveyard. There are many historical and archaeological sites in the parish, notably at Finlaggan, the historic base of the Lords of the Isles. Kilmeny parish was linked with Kilchoman and Portnahaven in 2006.

PORTNAHAVEN CHURCH was built in 1828 with funds voted by Parliament to a design by the famous engineer Thomas Telford. The parish was created in the south of the Rhinns of Islay in 1824. One of the very few Telford churches in Scotland which remain unaltered (except for the glazing of the windows behind the altar, and the internal decor), and which has a balcony subscribed for by the congregation. Portnahaven was linked with Kilchoman in 1962 and further linked with Kilmeny in 2006.