BSN
BSN is an abbreviation for:
- Baloncesto Superior Nacional , professional basketball league in Puerto Rico
- Commander of the naval forces of the North Sea , former area commander of the German Navy
- Commander in charge of securing the North Sea (BSN, 1937–1945)
- Disabled Sports Association Lower Saxony eV
- Bio-Engineered Supplements and Nutrition , American dietary supplement manufacturer
- Boussois-Souchon-Neuvesel , French glass and food manufacturer, now Danone
- BSN medical (Beiersdorf and Smith & Nephew), German medical device manufacturer
