YK or yk may refer to:
Places Yellowknife, Northwest Territories, the capital of the Northwest Territories of Canada Yogyakarta, a city in Indonesia Yogyakarta railway station, a railway station in Yogyakarta (station code YK) Yukon, a territory in Canada (with any casing, within internet TLD .CA, and as YK for an unofficial postal abbreviation)
In business IATA airline codes: YK, former code for Cyprus Turkish Airlines (defunct since June 2010) Avia Traffic Company of Kyrgyzstan (starting between June 2010 and end of 2015) Yugen kaisha, a form of business organization in Japan
Other uses Yom Kippur, a Jewish Day of Atonement Yottakelvin, a measure of temperature equal to 1 septillion kelvin, or 1000000000000000000000000K