BNF

BNF may refer to:

Science

• Backus–Naur form, a formal grammar notation in computer science
• Biological nitrogen fixation
• British National Formulary, a drug reference manual
• β-Naphthoflavone, an organic compound

Organisations

• British Nutrition Foundation, a charity
• Bibliothèque nationale de France (BnF), the French national library

Political parties

• Balawaristan National Front, Pakistan
• Belarusian National Front ()
• BPF Party, break-away group from 1993 ()
• Botswana National Front
• British National Front

Other uses

• Big Name Fan, a well-known fan