| Word/Phrase | Definition | Useage |
| Ulnager | Examiner of woollen goods prior to sale | UK Occupation |
| ultimo (ult.) | last | Latin |
| Ultimo | In the month before this one. | General |
| undantag | support after giving up an estate | Swedish |
| undantagsman kvinna | person receiving support after giving his estate to another | Swedish |
| under | under | Swedish |
| Underlooker / Underviewer | Worked underground in coalmines in a sort of health and safety role, inspecting and regulating the miners in and out of the pit | UK Occupation |
| underskrift | signature | Swedish |
| Undertaker | 1. An undertaker of works, or clerk of works, for example for a turnpike road 2. Someone who undertakes to arrange a funeral service | Scot.Occup |
| undertecknad | the undersigned | Swedish |
| Underwood Dealer | See Coppice Dealer. | UK Occupation |
| ung | young | Swedish |
| ungkarl | bachelor | Swedish |
| Union | The United States; also the North during the Civil War, the states which did not secede. | General |
| Upholder | 1) Upholsterer 2) Made quilts & mattresses 3) Auctioneer's assistant More Info. | UK Occupation |
| Upholdster | Dealer in second-hand clothes and furniture | UK Occupation |
| Upholsterer | Pads and covers soft furniture - see upholder | UK Occupation |
| uppgavs | stated, given, declared | Swedish |
| Upright Worker | Chimney sweep | UK Occupation |
| Urgroßmutter | Great-grandmother | Germany |
| Urgroßvater | Great-grandfather | Germany |
| ut | out | Swedish |
| utan | without | Swedish |
| utanför | outside | Swedish |
| utdrag | extract | Swedish |
| utesluten | excommunicated | Swedish |
| utflyttning | moving out | Swedish |
| utflyttningsbetyg | moving out certificates | Swedish |
| utflyttningslängd | moving out register | Swedish |
| utländsk | foreign | Swedish |
| utsot | diarrhea | Swedish |
| utvandrare | emigrant | Swedish |
| utvandring | emigration | Swedish |
| uxor (ux, vx) | wife | Latin |