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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