The objective of this study is to analyze adolescents' knowledge and perceptions of Chile's Family Planning Program. A cross-sectional study using both quantitative (semi-structured surveys) and qualitative (focus group technique and individual surveys) research methods was conducted with a sample of 277 adolescents aged 15-19 years who were users of the Hospital de El Carmen, in the year 2010. The study results showed that 12% of the participants had initiated sexual activity (of this group, 42% of males and 22% of females had done so before the age of 15). Although all participants recognized that both partners should take responsibility, women consulted the program more frequently than men (13.5% of males and 40% of females had consulted the program). Women also acknowledged receiving more information on birth control methods before initiating sexual activity than their male peers. Adolescents of both sexes continue to have misconceptions about birth control. Therefore, it is necessary to enhance activities aimed at heightening awareness of the program among adolescents.