Hydroxylamine is a reactive chemical with formula NH2OH. It can be considered a hybrid of ammonia and water due to parallels it shares with each. At room temperature pure NH2OH is ordinarily a white, unstable crystalline, hygroscopic compound;however it is almost always encountered as an aqueous solution.

Hydroxylamine and its salts are commonly used as reducing agents in a myriad of organic and inorganic reactions. They can also act as antioxidants for fatty acids. Some non-chemical uses include removal of hair from animal hides and photography developing solutions.

Hydroxylamine may explode on heating. It is an irritant to the respiratory tract, skin, eyes, and other mucous membranes. It may be absorbed through the skin, is harmful if swallowed, and is a possible mutagen.

Identifiers
CAS number	7803-49-8
PubChem	787
SMILES	[show] NO
Properties
Molecular formula	NH2OH
Molar mass	33.0298 g/mol
Appearance	white needles or flakes
Density	1.21 g cm−3
Melting point	33 °C
Boiling point	110 °C
Solubility in water	soluble in cold water, decomposes in hot water