UBL
The acronym UBL can also mean:

Usama bin Ladin (1957–2011), Saudi-born militant and founder of al-Qaeda
Hubli Junction railway station, station code:UBL
Ulster Bank Limited, a retail banking subsidiary of NatWest Group
Ultimate Band List 
United Bank Limited 
Unilever Bangladesh Limited
United Basketball League
Universal Business Language, an ISO standard XML vocabulary for invoices, purchase orders, waybills, etc. 
Ubiquitin-like proteins