| Collection | Reference |
| Illustrations for Sir Walter Scott's Waverley Novels | Acc.12812 |
| Inchaffray Register [transcript] | MS.2685 |
| Inchcolm Abbey Register [transcript] | Adv.MS.9A.1.11 |
| Inchmahome Psalter | Acc.12780 |
| Incorporation of Candlemakers of Edinburgh | MSS.217-277 |
| Incorporation of Chapmen of East Neuk of Fife | MS.198 |
| Incorporation of Cordiners of Glasgow | Adv.MS.32.4.10 |
| Incorporation of Glovers and Skinners of Kelso | MSS.3081-3083 |
| Incorporation of Glovers of Kelso | MS.70 |
| Incorporation of Hammermen of Edinburgh | Ch.1485-1486 |
| Incorporation of Hammermen of Perth | Ch.15258-15321 |
| Incorporation of Hammermen of Perth | MSS.19239-19244 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Acc.7056 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Acc.7257 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Acc.7260 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Acc.7332 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Acc.7344 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Acc.7494 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Acc.8351 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Acc.8617 |
| Incorporation of Saint Mary's Chapel, Edinburgh | Dep.302 |
| Incorporation of Saint Mary's Chapel, Edinburgh | MS.1991 |
| Incorporation of Saint Mary's Chapel, Edinburgh | MS.2212 |
| Incorporation of Shoemakers of Linlithgow | Acc.9551 |
| Incorporation of Shoemakers of Linlithgow | Ch.15323-15325 |
| Incorporation of Shoemakers of Linlithgow | MSS.19290-19294 |
| Incorporation of Skinners and Furriers of Edinburgh | Acc.8770 |
| Incorporation of Tailors of Kinghorn | Acc.10039 [Mf.MSS.498] |
| Incorporation of Tailors of the Canongate, Edinburgh | MSS.1957-1990 |
| Incorporation of Weavers of Dunfermline | MS.3576 |
| Incorporation of Weavers of Galashiels [microfilm] | Acc.5072 [Mf.MSS.156] |
| Incorporation of Wrights of Culross | MSS.3577-3578 |
| Incorporation of Wrights of Dunfermline | MS.3866 |
| Incorporation of Wrights of Perth | MSS.19288-19289 |
| Independent Labour Party: Bo'ness Branch | Acc.9413 |
| Independent Labour Party: Edinburgh Central Branch | Acc.5241 |
| Inglis (Esther), Calligrapher | Acc.11624 |
| Inglis (Esther), Calligrapher | Acc.11821 |
| Inglis (Esther), Calligrapher | Acc.7633 |
| Inglis (Esther), Calligrapher | MS.20498 |
| Inglis (Esther), Calligrapher | MS.2197 |
| Inglis (Esther), Calligrapher | MS.25240 |
| Inglis (Esther), Calligrapher | MS.8874 |
| Inglis (Euphemia Amy Maria), `Innes Adair' | Acc.8493 |
| Inglis (H. R. Gall) | Acc.5132 |
| Inglis (Henry David), Traveller and Author | Acc.12832 |
| Inglis Collection | MSS.3327-3353 |
| Inglis Family | Acc.5335 |
| Inglis Family | Acc.6437 |
| Inglis Family [microfilm] | Acc.5409 [Mf.MSS.172] |
| Inglis Family [microfilm] | Acc.6587 [Mf.MSS.264] |
| Innerleithen and Walkerburn Co-Operative Societies | Dep.177 |
| Innerpeffray Library Borrowers' Ledger [microfilm] | Acc.11886 |
| Innes (Andrew L.) | Acc.13000 |
| Innes (Andrew L.) | Acc.13001 |
| Innes (Cosmo), Antiquary | Acc.7183 |
| Innes (Gilbert J.) | Acc.5498 |
| Innes (Gilbert) | Acc.3796 |
| Innes (Sue), Author and Journalist | Acc.12544 |
| Innes (Sue), Author and Journalist | Acc.12633 |
| Innes (Sue), Author and Journalist | Acc.13434 |
| Innes and Scougal manuscript | Acc.12043 |
| Innes of Stow Papers | MSS.623-632 |
| Insh (George Pratt) | Dep.344 |
| International Brigade, Spanish Civil War | Acc.12802 |
| International Brigade, Spanish Civil War Papers | Acc.10043 |
| International Order of Good Templars, Saint Paul's Lodge, Wick | Acc.6037 |
| International Union of Students | Dep.224 |
| Inverness Courier | Acc.10097 |
| Inverness Scientific and Field Club | Acc.8839 |
| Inverness Trades and Labour Council [photocopy] | Acc.4629 |
| Iomaire Manuscript | Dep.347 |
| Iona Missal [fragments] | Adv.MSS.84.1.17-84.1.18 |
| Iona Psalter | MS.10000 [Mf.Sec.MSS.79]. |
| Ireland (Mairi Campbell), Author and Broadcaster | MSS.19326-19328 |
| Ironfounding Workers' Association | Acc.9095 |
| Ironside (Ralph Anthony), of Tennochside | Acc.6779 |
| Ironside Family | Acc.9494 |
| Irvine (Alexander), of Drum | Acc.9025 |
| Irvine (Alexander), of Drum | Acc.9272 |
| Irvine (Alexander), Rev., collection of papers of Allan Stewart of Innerhadden | Acc.13054 |
| Irvine (Archibald Clive), Rev., Dr, Medical Missionary, Kenya | Acc.12016 |
| Irvine (Archibald Clive), Rev., Dr, Medical Missionary, Kenya | Acc.12801 |
| Irvine (Francis), son of Alexander Irvine of Drum | Acc.13147 |
| Irvine Burns Club [microfilm] | Acc.7718 [Mf.MSS.364] |
| Irvine Family, of Drum | Acc.9405 |
| Irvine Robertson Family | Acc.13156 |
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