YB or Yb may refer to:
Arts and entertainment YB (band), a South Korean rock band (short for Yoon Do Hyun Band) YoungBoy Never Broke Again (born 1999), American rapper Young Buck (born 1981), rapper
Businesses and organizations Youngstown Belt Railroad, a part of the Ohio Central Railroad System Ypatingasis būrys, a Nazi killing squad primarily composed of Lithuanian volunteers BSC Young Boys, a Swiss football club
Computing Yottabit (Yb), a unit of information used, for example, to quantify computer memory or storage capacity Yottabyte (YB), a unit of information used, for example, to quantify computer memory or storage capacity
Other uses Yb, Russia, a rural locality in the Komi Republic Yang Berhormat, Malay for The Honorable, styled before Members of Parliament Ytterbium, symbol Yb, a chemical element YB, vehicle registration prefix for rickshaws in Yogyakarta, Indonesia