The guar or cluster bean, with the botanical name Cyamopsis tetragonoloba, is an annual legume and the source of guar gum.

It is also known as Gavar, guar, or guvar bean.

The gum made from its seeds is used in the extraction of shale gas . The seeds of the guar bean contain a large endosperm. This endosperm consists of a large polysaccharide of galactose and mannose. This polymer is water-soluble and exhibits a viscosifying effect in water.

Guar gum has a multitude of different applications in food products, industrial products, and the extractive industry.