Herpsilochmus is a genus of birds in the antbird family (Thamnophilidae). They are found in forest, woodland and shrub in South America, although a single species (H. rufimarginatus) also occurs in Panama. All are relatively small antbirds that are sexually dichromatic. In most (but not all) species males are essentially light grey with a black crown and black-and-white wings, while females are more buff or rufous with black-and-white crown.