R elationship Between Knowledge About Osteoporosis And Milk Consumption In Students BACKGROUND SMOOTH Milk is the main source of calcium and phosphorus which is very important for bone formation. Milk is very well consumed in the mass of adolescents, because in the juvenile mass bone formation occurs which is a preparatory mass to reach the peak of bone mass growth. Osteoporosis is a disease characterized by low bone mass and a deterioration in bone tissue structure, causing bone vulnerability and an increased risk of fractures. This study aims to determine whether there is a relationship between knowledge about osteoporosis and milk consumption in high school students. METHOD The type of research is observational analytic using cross sectional design conducted during July to October 2017. Cluster sampling and simple random sampling were taken on 182 respondents at SMA Negeri 2 Mejayan. Data were collected using the osteoporosis knowledge questionnaire and milk consumption questionnaire. The data obtained were carried out statistical tests using the chi-square test. RESULTS Subjects who were knowledgeable about low osteoporosis found 27 people (50.0%) did not drink milk significantly significantly compared to subjects with knowledge of high osteoporosis as many as 5 people (3.9%) . In the analysis using Chi-square test showed that there was a significant relationship between knowledge about osteoporosis and milk consumption in high school students (p = 0,000). CONCLUSION This study showed that there was a significant relationship between knowledge about osteoporosis and milk consumption in high school students.