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Happiness is one of the most important element for human life, man happy to be healthier both mentally and physically. One of the factors that can affect happiness is to help others. Research on this subject in Indonesia is still small. The purpose of this study was to determine whether there is a contribution of prosocial behavior toward happiness in the late adolescent. The sample in this study amounted to 158 people with the characteristics of women and men aged 16-22 years old and resides in the Jabodetabek area. This study uses a simple linear regression analysis to determine the contribution of prosocial behavior toward happiness in the late adolescent. Based on the analysis that has been done, get the significance of 0.000 and R square of 0.182. This shows that there is a very significant contribution to the happiness of prosocial behavior in the late teens and prosocial behavior has a stake of 18.2%. Late adolescent who perform prosocial behaviors will undergo significant changes in happiness.