Ammonium chloride is an inorganic chemical compound with the chemical formula NH₄Cl, also written as [NH₄]Cl. It is an ammonium salt of hydrogen chloride. It consists of ammonium cations [NH₄]⁺ and chloride anions Cl⁻. It is a white crystalline salt that is highly soluble in water. Solutions of ammonium chloride are mildly acidic. In its naturally occurring mineralogic form, it is known as salammoniac. The mineral is commonly formed on burning coal dumps from condensation of coal-derived gases. It is also found around some types of volcanic vents. It is mainly used as fertilizer and a flavouring agent in some types of liquorice. It is a product of the reaction of hydrochloric acid and ammonia.

नौसादर (अमोनियम नीरेय) एक अकार्बनिक यौगिक है जिसका अणुसूत्र NH₄Cl है। यह श्वेत रंग का क्रिस्टलीय पदार्थ है जो जल में अत्यधिक विलेय है। इसका जलीय विलयन हल्का अम्लीय होता है। प्राकृतिक रूप से पाया जाने वाला साल अमोनियक (Sal ammoniac) अमोनियम नीरेय (क्लोराइड) का खनिज (mineralogical) रूप है।