UK usually refers to the United Kingdom, a country in Europe.

UK, U.K., Uk, or uk may also refer to:

• U.K. (band), a progressive rock supergroup
  • U.K. (album), by U.K.
• UK Records, a record label

• Charles University (Czech: Univerzita Karlova), in Prague, Czech Republic
• Comenius University (Slovak: Univerzita Komenského), in Bratislava, Slovakia
• Kongo University (French: l’Université Kongo), in the Democratic Republic of the Congo
• Universidad Argentina John F. Kennedy, Argentina
• University of Kara, Togo
• University of Kashmir, India
• University of Kentucky, United States or its athletic program, the Kentucky Wildcats
• University of Kragujevac, Serbia

• Uk (Cyrillic), a digraph in early Cyrillic alphabet
• uk, the Ukrainian language's ISO 639-1 code
• Universala Kongreso de Esperanto or World Congress of Esperanto

• Uttarakhand, a state of India
• Uk, an urban-type settlement in Irkutsk Oblast, Russia

• .uk, the United Kingdom's top-level Internet domain
• UK (ICAO airport codes), airports in Ukraine
• Vistara (IATA airline code UK)

• United Kingdom (disambiguation)