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Dioxin may refer to:

*1,2-Dioxin or 1,4-Dioxin, two unsaturated Heterocyclic#6-Membered rings, heterocyclic 6-membered rings where two carbon atoms have been replaced by oxygen atoms, giving the chemical formula#Molecular formula, molecular formula C₄H₄O₂
*Dibenzo-1,4-dioxin, the parent compound also known as dibenzodioxin or dibenzo-''p''-dioxin (molecular formula C₁₂H₈O₂), in which two benzene rings are connected through two oxygen atoms
*Dioxins and dioxin-like compounds, a diverse range of chemical compounds which are known to exhibit "dioxin-like" toxicity
*2,3,7,8-Tetrachlorodibenzodioxin (TCDD), the prototypical example of the above class, often referred to simply as "dioxin"

See also

*1,4-Dioxane, the saturated analog
*Agent orange, of which TCDD is a marginal component
*Digoxin
*Dioxin affair, a 1999 crisis in Belgium
*Seveso disaster, a 1976 crisis in Italy
*Times Beach, Missouri, a town contaminated by dioxin waste
{{Chemistry index