Some anthropometric characteristics in male Chilean adolescents, of mid-high socioeconomic level were registered as part of a larger research dealing with the clinical, psychological and cultural characteristics of Chilean adolescents. Observed values for height, weight and growth spurt time were similar to those described for British adolescents (Tanner) and are significantly higher than those observed in the Chilean adolescents from a lower socioeconomical stratum. It is postulated that height is more influenced by socioeconomical conditions than by genetic factors. Trunk and extremities grow in the same proportions during adolescence. The growth of the thrunk coincides with the growth's spurt at 14 years of age. The extremities grow in two peaks, the first at 10 years and the second at 14 years. (Key words: Body, growth, adolescent, males).Los cambios biologicos son un fenomeno tan evidente en la adolescencia que incluso se han usado como indicadores del inicio de esta etapa. En nuestro pai's no contamos con muchos estudios acerca del patron caracteristico del desarrollo biologico del adolescente y tarnpoco disponemos de estudios empiricos acerca de su interrelacion con el desarrollo psicologico. Pensamos que para lograr resolver estos problemas es indispensable un trabajo interdisciplinario usando