۴،۱-دی‌اکسان

Also known as Diethylene dioxide, Diethylene ether, Dioxan, p-Dioxane, dioxane-1,4, 1,4-dioxacyclohexane, glycol ethylene ether, di(ethylene oxide)

1,4-Dioxane () is a heterocyclic organic compound, classified as an ether. It is a colorless liquid with a faint sweet odor similar to that of diethyl ether. The compound is often called simply dioxane because the other dioxane isomers (1,2- and 1,3-) are rarely encountered.