| Collection | Reference |
| Union Friendly Society, Gilcomston | Acc.8344 |
| Union of Communication Workers: Edinburgh Branch (formerly part of the Union of Post Office Workers) | Acc.11553 |
| Union of Shop Distributive and Allied Workers, Edinburgh (St Cuthbert’s) Branch | Dep.359 |
| Union Society of Journeyman Bookbinders [microfilm] | Acc.4231 [Mf.MSS.239] |
| United Kingdom Society of Coachmakers | Acc.4046 |
| United Kingdom Society of Coachmakers | Acc.4214 |
| United Operative Plumbers' Association of Scotland [microfilm] | Acc.4377 [Mf.MSS.112] |
| United Presbyterian Church Selkirk Trinidad Mission | Acc.13180 |
| United Society of Boilermakers and Shipbuilders: Leith Branch | Acc.4596 |
| University of Edinburgh, Centre on Constitutional Change: Scottish Independence Referendum 2014 | Acc.13625 |
| Urquhart (Frederick Burrows), Poet | MSS.26992-26997 |
| Urquhart of Burdsyard Papers | MS.9241 |
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