O
- (Argyll and Bute) Orsay Island
- (The Scottish Borders) Oxton
- (Shetland Islands) Outer Flaess
- (Eilean Siar) Outer Hebrides
- (Orkney Islands) Outer Holm
- (Shetland Islands) Outer Holm of Skaw
- (Shetland Islands) Skerries Exteriores
- (Shetland Islands) Oxna Island
- (Highland) Ose
- (East Lothian) Oldhamstocks
- (Highland) Overscaig
- (Highland) Oldshoremore
- (Highland) Obinan
- (Aberdeenshire) Oyne
- (The Scottish Borders) Oxnam
- (Eilean Siar) Orosay
- (Eilean Siar) Orosay
- (Eilean Siar) Orosay
- (Eilean Siar) Oronsay
- (Highland) Oronsay
- (Highland) Oronsay
- (Argyll and Bute) Oronsay
- (Highland) Ornsay
- (Shetland Islands) Ormal
- (Orkney Islands) Orkney Islands
- (Shetland Islands) Orfasay
- (Eilean Siar) Old Hill
- (Highland) Oldany Island
- (Highland) Oigh Sgeir
- (Dumfries and Galloway) Old Bridge of Urr