1,3-Butanediol

1,3-Butanediol is an organic compound with the formula HOCH₂CH₂CH(OH)CH₃. It is a chiral diol. The compound is a colorless, water-soluble liquid. It has no large scale uses. It is one of four stable structural isomers of butanediol.

In biology, 1,3-butanediol is used as a hypoglycaemic agent. 1,3-Butanediol can be converted into β-hydroxybutyrate and serve as a substrate for brain metabolism.