Kala Namak also known as black salt or black Indian salt, is a salty and pungent smelling condiment used in South Asia. The condiment is composed largely of sodium chloride with several impurities lending the salt its colour and smell. The smell is mainly due to sulfur content.

Kala Namak is considered a cooling spice in ayurvedic medicine and is used as a laxative and digestive aid. It is also believed to relieve intestinal gas and heartburn. It is used in Jammu to cure goiters