敌敌畏（dichlorvos）又称二氯松，属于有机磷酸酯类化合物，分子式C₄H₇Cl₂O₄P，是一种常用的环境卫生杀虫剂。分子结构如图。

Dichlorvos or 2,2-dichlorovinyl dimethyl phosphate (commonly abbreviated as DDVP) is a organophosphate, widely used as an insecticide to control household pests, in public health, and protecting stored product from insects. The compound has been commercially available since 1961 and has become controversial because of its prevalence in urban waterways and the fact that its toxicity extends well beyond insects.