Thirty eight genera and 53 species of Tachinid (Díptera: Tachinidae) parasitic flies are reportedin this paper as common and frequent in the National Reserve of Ihe Río Clarillo located at the footsteps of the Andes in our Región Metropolitana of Santiago (33e51‘Lat. S-705 29‘Long O). Theexamples were collected with net and Malaise trap during the wholc year around from September1987 to September 1990. The natural vegetation of the Reserve is briefly described. The SubfamilyGoniinae are the best represented at the Reserve. The known hosts of these 53 species are larvae ornymphs of several families of Lepidoptera, of Coleóptera, and Hemiptera and may be other so farundetecled Orders of Insects. The preserved examples are deposited at the Insects Collection of theInstituto de Entomología, Santiago.