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Background: Teenage pregnancy is one of the indirect causes of high maternal mortality, the high rate of teenage pregnancy is influenced by one of them due to lack of knowledge and attitudes. This study aims to determine the effect of health education through audio visual on adolescents- knowledge and attitudes in preventing teenage pregnancy. Methodology: This study is a true experiment using randomized control trials with 48 respondents, divided into 24 respondents of intervention group and 24 respondents of control group. The intervention group was given health education through audio visual. The research instrument used a questionnaire. Statistical tests using Paired t-test, Independent t-test, Wilcoxon and Mann Whitney Research Results: The statistical test results showed that there were significant differences in the posttest of knowledge between the intervention group and the control group. Likewise, the value of the attitude variable indicates that there are significant differences in posttest attitudes between the intervention group and the control group. Conclusion: Health education through audio visual can significantly improve the adolescents knowledge and attitudes about prevention of teenage pregnancy.