Other
- bso, the ISO 639 designation for the language spoken by a tribe in western Chad
- BSO, a European information technology company founded by Eckart Wintzen, now a part of Atos Origin
- Baloch Students Organization, Balochistan, Pakistan
- Bank of Syria and Overseas, Syria
- Basco Airport, Batanes, Philippines
- Basic Security Option, an option for internet protocol datagrams defined in RFC 1108
- Basilian Salvatorian Order, a Catholic monastic community in Lebanon
- Black September Organization, a Palestinian militant group
- Bicycle Shaped Object, cyclists' jargon for a poor quality bicycle
- Blue Stellar Object, an antiquated term for a radio-quiet quasar
- Brake Standard Open, a designation of British railway carriage
- Broward County Sheriff's Office, Florida, USA
- Business Support Organisation, for example a chamber of commerce
- Österreichische Bundes-Sportorganisation, the Austrian Federal Sports Organization
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