Abstract: This study aims to test whether there is the influence of gratitude and forgiveness training to increase happiness in adolescents. A total of 30 randomly selected adolescents involved in this research. Randomized pre-post test control group design was used to examine the module intervention. The results of data analysis using t-test showed a significant difference in happiness between the experimental group with the control group (t = 4.579, p = 0.000). These results demonstrated a positive effect of gratitude and forgiveness training to increase happiness.