Wikipedia
ONB
ONB may refer to:
- Old National Bancorp, stock symbol (an American holding company of Old National Bank)
- One Network Bank, a rural bank in Mindanao, Philippines
- Opera Nazionale Balilla, an Italian Fascist youth organization
- Order of New Brunswick, a Canadian decoration (post-nominal letters)
- Orthonormal basis, a notion in linear algebra
- Österreichische Nationalbibliothek, the national library of Austria