邻苯二甲酸二(2-乙基己)酯（英语：bis(2-ethylhexyl)phthalate 或 di(2-ethylhexyl)phthalate，缩写分别为BEHP与DEHP），又称邻苯二甲酸二辛酯、酞酸二辛酯（dioctyl phthalate，缩写DOP），化学式C₆H₄(CO₂C₈H₁₇)₂，为邻苯二甲酸与3-甲基庚醇生成的酯类化合物。它是最重要的邻苯二甲酸酯，也是使用最广和产量最大的塑化剂。

Bis(2-ethylhexyl) phthalate (di-2-ethylhexyl phthalate, diethylhexyl phthalate, DEHP; dioctyl phthalate, DOP), is an organic compound with the formula C₈H₄(C₈H₁₇COO)₂. DEHP is the most common member of the class of phthalates which are used as plasticizers. It is the diester of phthalic acid and the branched-chain 2-ethylhexanol. This colorless viscous liquid is soluble in oil, but not in water. Accounting for an almost 54% market share in 2010, DEHP is a High Production Volume Chemical.