XK

XK may refer to:

• XK (protein), a protein responsible for Kx antigen which helps determine a person's blood type
• XK (2015 album), by Brendan Croskerry
• Jaguar XK, a car series made by Jaguar
• Jeep Commander XK, a SUV made by Jeep
• Republic of Kosovo, ISO 3166-1 alpha-2 user-assigned code element XK (user assigned code)
  • .xk, the unofficial ccTLD of the Republic of Kosovo
• CCM Airlines (IATA airline designator XK)
• X-K aka X Kryptonite
• XK, United States aircraft designator for Experimental Tanker