| Name | Description | Type | |
|---|---|---|---|
| Oa kirk session | A church court that sat within the presbytery of Islay and Jura and the synod of Argyll. | Church court | view |
| Oathlaw kirk session | A church court that sat within the presbytery of Brechin until 1731, later of Forfar, and the synod of Angus and Mearns. | Church court | view |
| Oban - Old kirk session | A church court that sat within the presbytery of Lorn and the synod of Argyll. | Church court | view |
| Oban - St Columba's kirk session | A church court that sat within the presbytery of Lorn and the synod of Argyll. | Church court | view |
| Ochiltree kirk session | A church court that sat within the presbytery of Ayr and the synod of Glasgow and Ayr. | Church court | view |
| Old Cumnock kirk session | A church court that sat within the presbytery of Ayr and the synod of Glasgow and Ayr. | Church court | view |
| Old Deer kirk session | A church court that sat within the presbytery of Deer and the synod of Aberdeen. | Church court | view |
| Old Kilpatrick kirk session | A church court that sat within the presbytery of Dumbarton and the synod of Glasgow and Ayr. | Church court | view |
| Old Luce kirk session | A church court that sat within the presbytery of Stranraer and the synod of Galloway. | Church Court | view |
| Old Monkland kirk session | A church court that sat within the presbytery of Hamilton and the synod of Glasgow and Ayr. | Church court | view |
| Oldhamstocks kirk session | A church court that sat within the presbytery of Dunbar and the synod of Lothian and Tweeddale. | Church court | view |
| Olnafirth presbytery | A higher court of the Church of Scotland. | Church Court | view |
| Olrig kirk session | A church court that sat within the presbytery of Caithness and the synod of Sutherland and Caithness. | Church court | view |
| Ord kirk session | A church court that sat within the presbytery of Fordyce and synod of Aberdeen. | Church court | view |
| Ordiquhill kirk session | A church court that sat within the presbytery of Fordyce, and the synod of Aberdeen. | Church court | view |
| Orkney synod | A higher court of the Church of Scotland. | Church court | view |
| Ormiston kirk session | A church court that sat within the presbytery of Dalkeith and the synod of Lothian and Tweeddale. | Church court | view |
| Orphir kirk session | A church court that sat within the presbytery of Cairston and the synod of Orkney. | Church court | view |
| Orwell kirk session | A church court that sat within the presbytery of Kinross and the synod of Fife. | Church court | view |
| Overtown kirk session | A church court that sat within the presbytery of Hamilton and the synod of Glasgow and Ayr. | Church court | view |
| Oxnam kirk session | A church court that sat within the presbytery of Jedburgh and the synod of Merse and Teviotdale. | Church court | view |
| Oyne kirk session | A church court that sat within the presbytery of Garioch and the synod of Aberdeen. | Church court | view |