| údolívalleyNoun | Noun |
| ugrilovatgrillVerb | Verb |
| uhlícoalNoun | Noun |
| uchoearNoun | Noun |
| ujetleave; drive awayVerb | Verb |
| ukázatshowVerb | Verb |
| ukázkasampleNoun | Noun |
| ukazovatshowVerb | Verb |
| ukládatsave; storeVerb | Verb |
| úklidcleaningNoun | Noun |
| ukliditclean up; tidyVerb | Verb |
| uklidnit secalm downVerb | Verb |
| uklízečcleanerNoun | Noun |
| uklízečkafemale cleanerNoun | Noun |
| uklízetclean; tidyVerb | Verb |
| úkoltask or assignmentNoun | Noun |
| ukončitend; terminateVerb | Verb |
| UkrajinaukrajinaUkraineNoun | Noun |
| UkrajinecukrajinecUkrainian manNoun | Noun |
| UkrajinkaukrajinkaUkrainian womanNoun | Noun |
| ukrajinskyin UkrainianAdverb | Adverb |
| ukrajinštinaUkrainian languageNoun | Noun |
| ukráststealVerb | Verb |
| uletětfly awayVerb | Verb |
| ulicestreetNoun | Noun |
| uložitsave; storeVerb | Verb |
| ultrazvukultrasoundNoun | Noun |
| umělecartistNoun | Noun |
| uměleckýartisticAdjective | Adjective |
| umělkyněfemale artistNoun | Noun |
| umělýartificialAdjective | Adjective |
| uměníartNoun | Noun |
| umětknow how; be able toVerb | Verb |
| úmrtídeathNoun | Noun |
| umřítdieVerb | Verb |
| umýtwashVerb | Verb |
| umýt sewash oneselfVerb | Verb |
| umyvadlowash basinNoun | Noun |
| unavenětiredly, in a tired wayAdverb | Adverb |
| unavenýtiredAdjective | Adjective |
| unieunionNoun | Noun |
| uniformauniformNoun | Noun |
| univerzálníuniversalAdjective | Adjective |
| univerzitauniversityNoun | Noun |
| univerzitníuniversityAdjective | Adjective |
| únorFebruaryNoun | Noun |
| únorovýFebruaryAdjective | Adjective |
| upéctbake; roastVerb | Verb |
| úplněabsolutely, fully, completelyAdverb | Adverb |
| uprostředin the middleAdverb | Adverb |
| upřímněhonestly, sincerelyAdverb | Adverb |
| upřímnýhonestAdjective | Adjective |
| úrazinjuryNoun | Noun |
| úrazovýaccidentAdjective | Adjective |
| určitědefinitely, certainlyAdverb | Adverb |
| určitýcertainAdjective | Adjective |
| úroveňlevelNoun | Noun |
| úřadofficeNoun | Noun |
| úředníofficialAdjective | Adjective |
| úřednicefemale officerNoun | Noun |
| úředníkofficerNoun | Noun |
| USAusaUSANoun | Noun |
| úschovnaleft-luggage officeNoun | Noun |
| uslyšethearVerb | Verb |
| usmažitfryVerb | Verb |
| úspěchsuccessNoun | Noun |
| úspěšněsuccessfullyAdverb | Adverb |
| úspěšnýsuccessfulAdjective | Adjective |
| ústamouthNoun | Noun |
| ústníoralAdjective | Adjective |
| ústřednícentralAdjective | Adjective |
| usušitdryVerb | Verb |
| ušetřitsaveVerb | Verb |
| ušiearsNoun | Noun |
| ušítsewVerb | Verb |
| úterníTuesdayAdjective | Adjective |
| úterýTuesdayNoun | Noun |
| utíratwipeVerb | Verb |
| utrácetspendVerb | Verb |
| utratitspendVerb | Verb |
| utřítwipeVerb | Verb |
| uvařitcookVerb | Verb |
| úvazekworkloadNoun | Noun |
| uvidětseeVerb | Verb |
| uvnitřinsideAdverb | Adverb |
| uzavřítto close; concludeVerb | Verb |
| uzdravit seget wellVerb | Verb |
| územíterritoryNoun | Noun |
| uzeninacold cut or sausageNoun | Noun |
| úzkýnarrowAdjective | Adjective |
| uznatto recognise; acknowledgeVerb | Verb |
| uznávatto recognise; acknowledgeVerb | Verb |
| užalready, only, no more, yetAdverb | Adverb |
| úžasnýamazingAdjective | Adjective |
| užít sienjoyVerb | Verb |
| užívatto use; takeVerb | Verb |
| vin, atPreposition | Preposition |
| vaditbother; mindVerb | Verb |
| vagonrailway carriageNoun | Noun |
| váhaweightNoun | Noun |