Current study is evaluation of the role of emotional maturity, cognitive and metacognitive approach in happiness of law enforcement officials in Shiraz. Statistical society of present study is composed of al personnel of law enforcement of Shiraz which a sample of 250 people were selected for sampling through available sampling. In order to evaluate studied variables, cognitive styles questionnaires (MSR), metacognitive beliefs questionnaires (MBS), Oxford happiness questionnaire (OHI) and emotional maturity questionnaire (EMS) were used. In order to data analysis, Pearson correlation and multiple regressions were used. Results of correlation analysis show that correlation coefficient between emotional maturity with happiness r=0.357 is meaningful, correlation coefficient between cognitive approach with happiness is meaningful and correlation coefficient between metacognitive approach with happiness is meaningful. Finally, it shows that multiple correlation coefficient is equal to MR=0.413 and determination coefficient is equal to RS=0.170 which is meaningful in level of p˂0.01.
