Happiness has shown to be linked with good health, success, and other positive psychology concepts. However, there are fewer studies on happiness, unlike illness. This study measured the effect of Positive Psychology Intervention on happiness levels and attribution style in emerging adults. A sample of 61 participants took the survey initially in which sample n = 10 was considered for the intervention. Eight-session online positive psychology intervention was designed for the selected sample. The exercises used for the intervention were evidence-based. Subjective Happiness Scale (Lyubomirsky, 1999) was used to measure the happiness levels of the participants. Attributional Style Questionnaire (Peterson et al., 1982) was also used. Results were obtained using Wilcoxon Signed-rank test, Pearson's correlation, and thematic analysis. Happiness was positively related with attributional style and positive psychology intervention had an effect on happiness and attribution style. Results suggest that suitable implementation of intervention can serve as a primary prevention strategy.