Divinylbenzene (DVB) is an organic compound with the chemical formula C₆H₄(CH=CH₂)₂ and structure H₂C=CH−C₆H₄−HC=CH₂ (a benzene ring with two vinyl groups as substituents). It is related to styrene (vinylbenzene, C₆H₅−CH=CH₂) by the addition of a second vinyl group. It is a colorless liquid manufactured by the thermal dehydrogenation of isomeric diethylbenzenes. Under synthesis conditions, o-divinylbenzene converts to naphthalene and thus is not a component of the usual mixtures of DVB.

It is produced by dehydrogenation of diethylbenzene:

Divinylbenzene is usually encountered as a 2:1 mixture of m- and p-divinylbenzene, containing also the corresponding isomers of ethylvinylbenzene.

Styrene and divinylbenzene react to form the copolymer styrene-divinylbenzene, S-DVB or Sty-DVB. The resulting cross-linked polymer is mainly used for the production of ion exchange resin and Merrifield resins for peptide synthesis.

These compounds are systematically called diethenylbenzene, although this nomenclature is rarely encountered.