- YK stands for You Know
- YK stands for Yellowknife (Northwest Territories, Canada)
- YK stands for Yugen Kaisha (Japanese business designation)
- YK stands for Radar Beacon (US Navy)
- YK stands for Yhdistyneet Kansakunnat (Finnish: United Nations)
- YK stands for Yakovlev (Soviet aircraft designer)
- YK stands for Yukon Territories
- YK stands for Yoko Kanno (composer and musician)
- YK stands for Yleistä Keskustelua (Finnish)
YK