- Biu, a town in Nigeria.
- Bar Ilan University, a university in Israel.
- Bermuda Industrial Union, a general trade union in Bermuda.
- Bus Interface Unit, a part of the processor that interfaces with the rest of the PC
- The IATA airport code for, Bíldudalur Airport, an airport serving Bíldudalur, a village in the Vesturbyggð municipality in the Westfjords of Iceland.