HNO

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

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