Formicarius is a genus of passerine birds in the family Formicariidae. These birds are all found in the tropical New World, from southern Mexico south to Central America and northern South America. All are named as antthrushes, and are insectivorous forest birds. They are largely terrestrial, feeding mainly on the ground on ants and other insects.

The rufous-capped antthrush is a small species of bird in the family Formicariidae located in the order Passeriformes. It is considered to be uncommon but widespread, found in Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela. The rufous-capped antthrush is typically found inhabiting the shady floor of tall, humid forests on solid ground, and is occasionally spotted in transitional forests (várzea) and savanna forests (Suriname).