Dibenzo-1,4-dioxin, also dibenzodioxin or dibenzo-p-dioxin (dibenzo-para-dioxin), is a polycyclic heterocyclic organic compound in which two benzene rings are connected by a 1,4-dioxin ring. Its molecular formula is C₁₂H₈O₂. The two oxygen atoms occupy opposite (para-) positions in the six-membered dioxin ring.