HNO may refer to:

• Croatian National Committee (Hrvatski narodni odbor), an organization founded by the Ustaša Branimir Jelić
• Croatian National Resistance (Hrvatski narodni otpor), an organization founded by the Ustaša Maks Luburić
• Hockey Northwestern Ontario
• Nitroxyl
• hno, ISO 639-3 code for the Northern Hindko language of Pakistan

This disambiguation page lists articles associated with the title HNO.
If an internal link led you here, you may wish to change the link to point directly to the intended article.