%X The 21st century brings a change in education. In order to compete in the 21st century, every education graduate must have good competence. CTL is the best way to develop student competence in this century. This is because CTL is closer to students' daily lives so that this teaching can increase the environmental literacy of students. However, the application of CTL in schools was still low. The solution to this problem is to use the mechanical wave module based on CTL into Physics teaching in schools. The purpose of this research is to determine the effect of the mechanical wave module based CTL on the environmental literacy of grade XI students. This research is a quasi-experimental research with a before and after design for one sample group. The research instrument consisted of a test of learning outcomes for the knowledge aspect and performance assessment sheet for the environmental literacy of students. The data were analyzed by descriptive statistics, normality test, homogeneity test, and paired comparison test. From the results of data analysis, it can be stated that the use of the mechanical wave module based on CTL has given a positive effect on the knowledge and environmental literacy of grade XI students with a confidence level of 95%. %D 2020 %K Mechanical wave, Module, CTL, Environmental Literacy. %L repounp39512 %P 44-50 %A Asrizal Asrizal %A Desnita Desnita %A Yenni Darvina %A Esti Aprilia Usman %T Mechanical Wave Module Based on CTL to Improve Environmental Literacy of Students %J International Journal of Progressive Sciences and Technologies (IJPSAT) %I International Journal of Progressive Sciences and Technologies (IJPSAT)