| Collection | Reference |
| Ogilvie (James), Deputy Commisary General | MSS.15201-15335 |
| Ogilvie (Iain Hamish), Civil Engineer | Acc.11851 |
| Ogilvie (William H. ), Author and Journalist | MSS.26027-26029 |
| Ogilvie of Barras Papers | MS.2051 |
| Ogilvie of Boyne Papers | MSS.21248-21249 |
| Ogilvy (David), Merchant, Leith | Acc.12526 |
| Ogilvy (William Baird), of Ascreavie House, Kirriemuir, formerly Young | Acc.13415 |
| Ogilvy of Bennachy | Acc.9322 |
| Ogilvy of Innerquharity Papers | Acc.5012 |
| Ogleface Friendly Society | Acc.3826 |
| Ogscastle deeds | Acc.5621 |
| Oliphant (Margaret Oliphant Wilson), Novelist | Acc.13098 |
| Oliphant (Margaret Oliphant Wilson), Novelist | Acc.13240 |
| Oliphant (Margaret Oliphant Wilson), Novelist | MSS.23193-23208 |
| Oliphant of Gask Papers | Adv.MSS 82.1.1-82.9.13 |
| Oliver (A. M.), Miss | Acc.9437 |
| Oliver (Frederick Scott) | MSS.24781-25100 |
| Oliver (George), Emigrant | Acc.13019 |
| Oliver (George), Emigrant | Acc.13020 |
| Oliver (John W.), Dr. | Acc.9120 |
| Oliver (Peter Roderick), Lieutenant-Colonel | Acc.12096 |
| Oliver (Peter Roderick), Lieutenant-Colonel | Acc.13124 |
| Oliver (Peter Roderick), Lieutenant-Colonel | MSS.24656-24720 |
| Oliver and Boyd, Publishers, Edinburgh | Acc.5000 |
| O'Neil (Felix), Captain, Officer of Prince Charles Edward | Acc.5491 |
| Operative Plumbers' Association of Great Britain and Ireland: Edinburgh Lodge | Acc.4961 |
| Order for the Glencoe Massacre | Adv.MS.23.6.24 |
| Order of the Garter | Adv.MS. 31.7.18 |
| Order of the Garter | Adv.MS.32.6.9 |
| Order of the Garter | Ch.A.43 |
| Order of the Garter | MS.7143 |
| Order of the Thistle | Adv.MS 34.6.2 |
| Order of the Thistle | Adv.MS.31.1.13 |
| Orr (Bob) | Acc.12766 |
| Orr (John Boyd), Baron Boyd Orr | Acc.6545 |
| Orr (Robin Kemsley), Composer | Acc.10462 |
| Orr (Robin Kemsley), Composer | Acc.10598 |
| Orr (Robin Kemsley), Composer | Acc.10670 |
| Orr (Robin Kemsley), Composer | Acc.10723 |
| Oswald (Henry Robert), Surgeon-General, India | Ch.8431-8434 |
| Oswald (Henry Robert), Surgeon-General, India | MSS.9001-9042 |
| Ouseley Family | MSS.21209-21213 |
| Outram (George) | Acc.13489 |
| Owens (Agnes), Novelist | Acc.12938 |
| Owens (Agnes), Novelist | Acc.8822 |
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