Introduction: Happiness was being called to function of a person in high level of emotion and behavioral adaptation, and not merely have no illness, and it has been reported as a personal trait that may cause positive copying and decrease of daily stress in persons. Material and Methods: In this study, 490 high school boy students; (mean = 15.67, SD = ±0.99 years) in Shandiz city were randomly selected. After the complement of questionnaires including; individual characteristics, quality of regular doing physical activity and Happiness; Chi-Square test was used to determine relationship between quality of regular doing physical activity, and Oxford Happiness subscales consist of lifesatisfaction, joy, self-esteem, calm, control and efficiency. Data were analyzed in significance level of P≤0.05. Results: Results showed that 67.36% of students regularly were doing physical activity. A significant difference was observed between regular physical activity and happiness, generally, and self-esteem, calm and control subscales separately. Also significant difference was existed between number of physical activity a week with happiness, generally, and control subscale, separately. Discussion and Conclusion: Results showed that students who were regularly performed physical activity had more happiness. Thus, sport may be as an affected factor in increase of happiness among boy students in high school.

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