| Collection | Reference |
| A. and C. Black, Publishers, Edinburgh | Acc.9765 |
| Abbey School, Stirling | Acc.5555 |
| Abbot (Ian), poet and writer | Acc.12737 |
| Abbotsford Collection | Ch.708-857 |
| Abbotsford Collection | MS.1762 |
| Abbotsford Collection | MSS.1549-1634 |
| Abbotsford Collection | MSS.851-938 |
| Abercromby (James), 1st Baron Dunfermline | MSS.24725-24776 |
| Aberdeen Cartulary | Adv.MS.16.1.10 |
| Aberdeen Cartulary | Adv.MS.34.4.4 |
| Aberdeen Cartulary [transcript] | Adv.MS.15.1.9 |
| Aberdeen Cartulary [transcript] | Adv.MS.20 3.1 |
| Aberdeen Cartulary [transcript] | Adv.MS.22.2.1 |
| Aberdeen Cartulary [transcript] | Adv.MS.35.3.4 |
| Aberdeen Psalter and Hours | Adv.MS.18.8.14 |
| Aberdeen Soup Kitchen | Acc.5426 |
| Action on Smoking and Health (Scotland) | Acc.12241 |
| Adair Maps | Adv.MS.70.2.11 |
| Adam (Robert), Architect | MS.20500 |
| Adam (Robert), Architect | MSS.19992-19993 |
| Adam (Robin), Professor of Medieval History, Saint Andrews University | Acc.11606 |
| Adam, of Dryburgh, Carthusian at Witham | MS.9999 |
| Adams, (David Rutherford), Lieutenant Captain | Acc.12889 |
| Advisory Council for the Arts in Scotland | Acc.10800 |
| Agnes Hume's Music Book | Adv.MS.5.2.17 |
| Airlie (J. M.) | Acc.11566 |
| Airlie (John McDiarmid), Labour Councillor and Parliamentary Candidate | Acc.13203 |
| Airth and Menteith Peerage Papers | Acc.7055 |
| Aitken (David), Revd., Dr., minister of Minto | Acc.13035 |
| Aitken (Mary Carlyle), Niece of Thomas Carlyle | Acc.10449 |
| Aitken (William Russell), Bibliographer | Acc.10488 |
| Aitken (William Russell), Bibliographer | Acc.11278 |
| Aitken (William Russell), Bibliographer | Acc.11748 |
| Aitken (William Russell), Bibliographer | Acc.9182 |
| Aitken Dott, Fine Art Dealers, Edinburgh | Acc.10421 |
| Albemarle Papers | MSS.3730-3731 |
| Albert (Edward), Author | MSS.9051-9152 |
| Album of photographs taken in Skye and the Western Highlands | Acc.13321 |
| Alexander Houston and Company, Merchants, Glasgow | MSS.8793-8800 |
| Alexander Houston and Company, Merchants, Glasgow | MSS.8895-8898 |
| Alexander Low Bruce Trust | Acc.13503 |
| Alexander Macalman's Music Book | MS.9477 |
| All Back to Bowie's: Scottish Independence Referendum 2014 | Acc.13585 |
| All Saints' Dining Club | Acc.10235 |
| Allan (David), Painter | Acc.12495 |
| Allan (Jean Mary), Librarian and Novelist | Acc.8844 |
| Allan (Thomas Ward), Tea Planter, North Bengal | Acc.13387 |
| Allen (Frederick Denison Campbell), Mountaineer | Acc.13313 |
| Allen (Janie), Suffragette | Acc.4498 |
| Allen (Roberta), Missionary, Kenya | Acc.12534 |
| Amalagamated Society of Woodworkers: Edinburgh Branch | Acc.4685 |
| Amalagamated Society of Woodworkers: Edinburgh Branch | Acc.4959 |
| Amalgamated Boilermakers, Shipwrights, Blacksmiths and Structural Workers, Leith, Shipwrights' Section | Acc.4596 |
| Amalgamated Boilermakers, Shipwrights, Blacksmiths and Structural Workers, Leith, Shipwrights' Section | Acc.4727 |
| Amalgamated Engineering Union: Edinburgh Central Branch | Acc.4725 |
| Amalgamated Engineering Union: Edinburgh District | Acc.4516 |
| Amalgamated Engineering Union: Falkirk Foundry Workers | Dep.204 |
| Amalgamated Engineering Union: Musselburgh Branch | Acc.9853 |
| Amalgamated Engineering Union: Reports | Acc.5734 |
| Amalgamated Society of Marble and Granite Makers: Edinburgh Branch | Acc.4724 |
| Amalgamated Society of Railway Servants | Acc.4221 |
| Amalgamated Society of Railway Servants | Acc.4342 |
| Amalgamated Society of Railway Servants: Portobello Branch | Acc.4597 |
| Amalgamated Society of Slaters, Scotland | Acc.4707 |
| Amalgamated Society of Woodcutting Machinists: Edinburgh Branch | Acc.4594 |
| Amalgamated Society of Woodworkers: South East of Scotland District (now part of the Union of Construction, Allied Trades and Technichians) | Dep.367 |
| Amalgamated Union of Engineering and Foundry Workers | Acc.5010 |
| Amalgamated Union of Engineering Workers: Foundry Section | Acc.9095 |
| Anderson (Andrew), Pinkerton, Dunbar | Acc.6738 |
| Anderson (Ann), Nurse, Australia | Acc.11468 |
| Anderson (David), Staff Surgeon | Acc.12538 |
| Anderson (George) | Acc.9969 |
| Anderson (George), Emigrant to Patagonia | Acc.13371 |
| Anderson (George), Emigrant to Patagonia | Acc.9031 |
| Anderson (Iain F.) | Acc.5768 |
| Anderson (James Henry), Civil Engineer | MSS.6354-6359 |
| Anderson (John), Emigrant to Ontario, Canada, and Margaret Anderson | Acc.13107 |
| Anderson (Robert), Editor of The Edinburgh Magazine | Adv.MS.22.3.11 |
| Anderson (Robert), Editor of The Edinburgh Magazine | Adv.MSS.22.4.10-22.4.17 |
| Anderson (William C.), Poet (1867-1951) | Acc.12878 |
| Anderson (William James), Archivist, Scottish Catholic Archives | Acc.7993 |
| Anderson (William), Rev., Missionary in Jamaica and Old Calabar | MS.3112 |
| Anderson (William), Rev., Missionary in Jamaica and Old Calabar | MSS.2981-2983 |
| Anderson Family, Lerwick | Acc.11699 |
| Andrew Fletcher Society | Acc.7119 |
| Andrew Lundy's Primer | Dep.221/5 |
| Andrew of Wyntoun's Chronicle | Adv.MSS.19.2.3-19.2.4 |
| Andrew of Wyntoun's Chronicle | MS.651 |
| Andrew Scott and Company, Woollen Merchants, Edinburgh | MS.19734 |
| Angus (David), Civil Engineer | Acc.12366 |
| Angus (David), Civil Engineer | Acc.6905 |
| Angus (David), Civil Engineer | Acc.7217 |
| Angus (David), Civil Engineer | Acc.7220 |
| Angus (David), Civil Engineer | Acc.7658 |
| Angus (Nancy) | Acc.12365 |
| Angus (William), of North Grange, Lindores | MS.17949 |
| Angus and Wilson Family papers | Acc.12366 |
| Angus MacArthur Piobaireachd Manuscript | MS.1679 |
| Annals of the Scottish Printing Trade | Acc.8166 |
| Annand (James King), Poet | Acc.10531 |
| Annand (James King), Poet | Acc.10803 |
| Annand (James King), Poet | Acc.10811 |
| Annand (James King), Poet | Acc.4190 |
| Annand (James King), Poet | Acc.4698 |
| Annand (James King), Poet | Acc.5190 |
| Annand (James King), Poet | Acc.9624 |
| Anonymous journal of mountaineering in Switzerland | Acc.3329 |
| Arbroath Abbey, Registrum Nigrum | Adv.MS.34.4.3 |
| Arbroath Abbey, Registrum Nigrum [transcript] | Adv.MS.35.3.3 |
| Arbroath Cartulary | Adv.MS.34.4.2 |
| Arbroath Cartulary [extracts] | Adv.MS.20.3.9 |
| Arbroath Cartulary [transcript] | Adv.MS.9A.1.18 |
| Archibald (William K), Scottish Nationalist Politician | Acc.13101 |
| Archibald (William), SNP Politician | Acc.13101 |
| Archibald Constable, Publisher, Edinburgh | Acc.12728 |
| Archibald Constable, Publisher, Edinburgh | MSS.319-332 |
| Archibald Constable, Publisher, Edinburgh | MSS.789-803 |
| Archibald Constable, Publisher, Edinburgh | Acc.11581 |
| Archibald Constable, Publisher, Edinburgh | MS.7200 |
| Archibald Constable, Publisher, Edinburgh | MS.8991 |
| Archibald Constable, Publisher, Edinburgh | MSS.23230-23234 |
| Archibald Constable, Publisher, Edinburgh | MSS.23618-23620 |
| Archibald Constable, Publisher, Edinburgh | MSS.668-684 |
| Arise Ministries: Scottish Independence Referendum 2014 | Acc.13550 |
| Armorial | Acc.13351 |
| Armstrong (John), Artist and Author | Acc.13315 |
| Armstrong (Robert Bruce), Antiquary | MSS.6110-6120 |
| Arundel (Honor) | Acc.10238 |
| Ashburner Papers | MSS.20351-20410 |
| Ashburton Papers | Acc.11388 |
| Ashiestiel Manuscript | MS.23053 |
| Ashiestiel Papers | MSS.3220-3235 |
| Asloan Manuscript | MS.16500 [ Mf.Sec.MSS.516] |
| Asloan Manuscript [photographs] | MSS.335-336 |
| Assamese Magical Manuscript | MS.1899 |
| Associated Ironmoulders of Scotland | Acc.5088 |
| Atlas of Europe (Mercator) | Acc.9193 |
| Attic Archive | Acc.13227 |
| Auchinleck Estate Papers | Acc.6632 |
| Auchinleck Manuscript | Adv.MS.19.2.1 |
| Auchterlonie (D. W.) and (Laurie), Golf Club-makers, Saint Andrews | Acc.10575 |
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