NH2

NH2 or similar may refer to:

• Azanide (chemical formula {{Chem|NH|2|-}})
• Amino radical (chemical formula {{Chem|NH|2|•}})
• Nitrenium ion (chemical formula {{Chem|NH|2|+}})
• Imide ion (chemical formula {{Chem|NH|2-}})
• Primary amide group (chemical formula {{chem|-NH|2}})
• National Harbor–Alexandria Line (Route NH2), a WMATA bus line between Alexandria, Virginia and Prince George's County, Maryland
• National Highway 2 (India)
• New Hampshire's 2nd congressional district

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