| STANDING STONE [nr Burnhouse] | OS1/23/21/20 |
| STANDING STONE [SE of Bridge of Brogar] | OS1/23/21/19 |
| STANDING STONES OF STENNESS | OS1/23/21/6 |
| STANDING STONES [Ness of Brogar] | OS1/23/21/19 |
| STANDING STONES [W of church] | OS1/23/21/20 |
| STENNESS | OS1/23/21/1 |
| STENNY HOLM | OS1/23/21/10 |
| STINES MOSS | OS1/23/21/78 |
| STONE CIST FOUND A.D. 1858 [tumulus, Hall] | OS1/23/21/40 |
| STOWERSDALE | OS1/23/21/60 |
| STYMILDERS | OS1/23/21/22 |
| SUMMERS DALE | OS1/23/21/64 |
| SUNNYDALE | OS1/23/21/56 |
| TAING OF CUMMINESS | OS1/23/21/41 |
| THE CAIRNS | OS1/23/21/43 |
| THE MOSS | OS1/23/21/18 |
| TORMISTON | OS1/23/21/17 |
| TUMULI [E of Standing Stones of Stenness] | OS1/23/21/10 |
| TUMULI [nr Yarpha] | OS1/23/21/58 |
| TUMULI [SE of Standing Stones of Stenness] | OS1/23/21/19 |
