Common health problems in children of this age are often related to poor hygiene and healthy living habits. Efforts that can be made to increase school-age children's knowledge about clean and healthy living behaviors include providing health education using audiovisual media and pamphlets. The type of research used is a pre-experimental design with a one group pre-post test approach. The population in this study consists of school-aged children aged 11-12 years, totaling 100 respondents. This study used the random sampling technique with 80 respondents. The research instrument used was a clean and healthy living behavior questionnaire. Most of the 80 respondents, totaling 60 respondents (75.2%), showed a low level of knowledge, (21.3%) a sufficient level of knowledge, and the post-test results from the 80 respondents, mostly 60 respondents (75.2%), showed a good level of knowledge. The Wilcoxon Sing Rank Test results in SPSS showed a significance value of ? = 0.000 < 0.05, meaning H1 is accepted. This means there is an influence of health education using audiovisual media and pamphlets on the knowledge level of school-aged children aged 11-12 years. The research conclusion shows that there is an influence on the knowledge level about clean and healthy living behaviors in school-aged children aged 11-12 years, with the provision of health education using audiovisual media and pamphlets. It is hoped that future researchers can modify it with other methods.