二甲苯, Xylene, Dimethylbenzene（C₈H₁₀）二甲苯（来自希腊语ξύλο，低聚木糖，“木”），二甲苯或二甲苯芳族烃混合物，组成的苯环在不同位置两个甲基基团。二甲苯的三种异构体分子式C8H10，或通过半结构式C6H4（CH3）2表示。二甲苯是通过催化重整，煤焦化成焦炭燃料的制造中产生的一个主要石化物。它约占原油的0.5-1％，并且在小批量的汽油和飞机燃料被发现。从催化重整称为“重整油”的萃取产物，二甲苯为BTX芳烃（二甲苯，苯和甲苯）的一部分的主要产物。该混合物是一种略带油腻，无色液体，被用作溶剂。作为木焦油的一个组成部分而被发现后，二甲苯于1851年被命名了。每年生产约数百万吨。2011年在新加坡，一个全球性的联盟开始建设了世界上最大的二甲苯厂。

Xylene (from Greek ξύλο, xylo, "wood"), xylol or dimethylbenzene is an aromatic hydrocarbon mixture consisting of a benzene ring with two methyl groups at various substituted positions. The three isomers of xylene have the molecular formula C₈H₁₀, also represented by the semi-structural formula C₆H₄(CH₃)₂. Xylene is a major petrochemical produced by catalytic reforming and also by coal carbonisation in the manufacture of coke fuel. It represents about 0.5–1% of crude oil (depending on the source), and is found in small quantities in gasoline and aircraft fuels. Xylenes are mainly produced as part of the BTX aromatics (benzene, toluene and xylenes) extracted from the product of catalytic reforming known as "reformate". The mixture is a slightly greasy, colorless liquid commonly encountered as a solvent. Xylene was first isolated and named in 1850 by the French chemist Auguste Cahours (1813–1891), having been discovered as a constituent of wood tar. Several million tons are produced annually. In 2011, a global consortium began construction of one of the world’s largest xylene plants in Singapore.