BSN may refer to:

• Bachelor of Science in Nursing, a nursing degree
• Badan Standardisasi Nasional, an Indonesian standardization agency
• Bally Sports North, American regional sports network owned and operated by Bally Sports
• Baloncesto Superior Nacional, basketball league in Puerto Rico
• Bank Simpanan Nasional, Malaysia
• Biotechnology Society of Nepal
• Blockchain-based Service Network, China
• Blue Square North, English football league
• Body sensor network
• Boussois-Souchon-Neuvesel, French company, renamed Groupe Danone in 1994
• Boy Scouts of Nippon, a former name of the Scout Association of Japan
• The British School in the Netherlands, The Hague
• Broadcasting System of Niigata, Japan
• Burgerservicenummer, the national identification number in the Netherlands