UAB stands for:
- Union active Brigittenau, a sports club in Vienna Brigittenau
- Autonomous University of Barcelona ( Universidad Autónoma de Barcelona), a university was founded in 1968 near the Spanish city of Barcelona
- University of Alabama at Birmingham, the University of the University of Alabama System, founded in 1969, second largest with 17,600 students
- Unix AppleTalk Bridge
- Closed Joint Stock Company (Lithuania ) ( Uzdaroji akcinė bendrovė ), a corporation as a legal entity of the Lithuanian private law, on the other natural or legal persons involved with a capital contribution.
UaB stands for:
- Holidays on the farm, a club and brand, sold under the Austria in the tourism sector private accommodations on farms