NH2

NH2 or similar may refer to:


 * Azanide (chemical formula )
 * Amino radical (chemical formula )
 * Nitrenium ion (chemical formula )
 * Primary amide group (chemical formula )
 * 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