| Site of PICT'S HOUSE [Peas Cairn] | OS1/7/9/25 |
| SÌTHEAN BUIDHE | OS1/7/9/167 |
| SITHEAN DUBH | OS1/7/9/138 |
| SITHEAN GLAS | OS1/7/9/172 |
| SÌTHEAN MÒR | OS1/7/9/169 |
| SKAIL [1895] | OS1/7/9/31 |
| SKIALL | OS1/7/9/31 |
| ST MARY'S CHAPEL (Remains of) | OS1/7/9/3 |
| ST MARY'S WELL | OS1/7/9/9 |
| STAILL | OS1/7/9/119 |
| STANDING STONE | OS1/7/9/126 |
| STANDING STONE [Shebster Hill] | OS1/7/9/43 |
| STANDING STONE [Sithean Dubh] | OS1/7/9/138 |
| STANDING STONE [Upper Dounreay] | OS1/7/9/43 |
| STANDING STONES | OS1/7/9/125 |
| STANDING STONES | OS1/7/9/52 |
| STANDING STONES [Broubster] | OS1/7/9/125 |
| STANDING STONES [Creag Breac Beag] | OS1/7/9/46 |
| STANDING STONES [Na Tri Sithean] | OS1/7/9/53 |
| STANDING STONES [Port an Eilein] | OS1/7/9/125 |
