Metal artifacts are discussed as possible indicators of relationships witin Mesoamerica and between Mesoamerica and the American Southwest. All known forms of Mesoamerican metal artifacts for which age and provenience data are available are included in a typological classification, presented as a basis for comparisons and distribution studies. Data on spatial and temporal distribution, with indications of centers of manufacture or use of some types, and with suggested maximum temporal range for each type, are included with the typological classification. Based on these data, a series of suggestions is presented regarding time of initial appearance of metals in various subareas of Mesoamerica, the importance of certain subareas from which metals diffused, and patterns and rates of diffusion within Mesoamerica and between Mesoamerica and the American Southwest.