In chemistry, a pyran is a six membered heterocyclic ring consisting of five carbon atoms and one oxygen atom and containing two double bonds. The molecular formula is C₅H₆O. There are two isomers of pyran that differ by the location of the double bonds. In 2H-pyran, the double bonds are at positions 2 and 4. In 4H-pyran, the double bonds are at positions 2 and 5.

Although the pyrans themselves have little significance in chemistry, a variety of their derivatives are important biological molecules.

The term pyran is also often applied to the saturated ring analog which is more properly referred to as tetrahydropyran. In this context, the monosaccharides containing a six-membered ring system are known as pyranoses. Hence, the six-membered ring form of glucose is known as D-glucopyranose.

Oxygen heterocycles

Pyrane | Pyrane | Pyraan