孔雀石绿（Malachite green，又名aniline green、basic green 4、diamond green B或victoria green B，IUPAC名称4-[(4-dimethylaminophenyl)-phenyl-methyl]-N,N-dimethyl-aniline）是一种有毒的三苯甲烷类人工合成有机化合物，既是染料，也是杀菌剂，可致癌。其制成可由1摩尔（mol）的苯甲醛和2摩尔的二甲苯胺在浓盐酸混和下，加热缩合成隐色素碱，在酸性下加过氧化铅使其氧化，并在溶液中沉淀出色素碱。

Malachite green is an organic compound that is used as a dyestuff and - controversially - as an antimicrobial in aquaculture. Malachite green is traditionally used as a dye for materials such as silk, leather, and paper. Although called malachite green, this dye is not prepared from the mineral malachite - the name just comes from the similarity of color.