2,3-Epoxybutane is an organic compound with the formula CH3CH(O)CHCH3.

The compound exists as three stereoisomers, a pair of enantiomers and the meso isomer.

All are colorless liquids.

2,3-Epoxybutane is prepared from 2-butene via the chlorohydrin:[1] A common reaction is its hydration to 2,3-butanediol.

Many such ring-opening reactions have been reported.