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
- Yang Berhormat, Malay for The Honorable, styled before Members of Parliament
- Ytterbium, symbol Yb, a chemical element
- Yogyakarta (trishaws/rickshaws prefix YB)