- BBSO stands for Big Bear Solar Observatory (Big Bear City, CA)
- BBSO stands for Birmingham-Bloomfield Symphony Orchestra (est. 1975; Michigan)
- BBSO stands for Brandeis Black Student Organization (student cultural awareness group; Brandeis University; Waltham, MA)
- BBSO stands for Best Buy Sports Outdoors
- BBSO stands for Belediye Bilgi Sistemleri Otomasyon
BBSO