The acronym UBL can mean:
People
Usama bin Ladin (1957–2011), the founder of al-Qaeda commonly known as Osama bin Laden
Organizations
Ulster Bank Limited, a retail banking subsidiary of NatWest Group United Bank Limited, Pakistani commercial bank Unilever Bangladesh Limited, subsidiary of the Unilever packaged goods corporation United Basketball League, a semi-professional American basketball league University Baseball League, a collegiate Taiwanese baseball league
Places Hubli Junction railway station in India, which has the station code UBL The Leiden University Library in the Netherlands, known in Dutch as the "Universitaire Bibliotheken Leiden"
Other
Ubiquitin-like proteins, a family of small proteins Universal Business Language, an open library of business documents Ultimate Band List, former online music database