Introduction: There is overwhelming evidence in the increase of dysfunctional SOCIAL well-being among service members returning from deployment, and this is culminating into a wide range of SOCIAL challenges. The present study investigated the PSYCHO-demographic factors influencing SOCIAL well-being among mobile police force in Kwara State, Nigeria. Method: The study adopted a survey method utilizing an ex-post-facto design. The purposive sampling technique was used to sample 200 mobile police officers (152 males and 48 females). They completed a questionnaire pack which included-the Post-Deployment Readjustment Inventory Scale, Emotion Regulation Questionnaire and Mental Health Continuum of SOCIAL Well-being-Short Form. Data were analyzed using descriptive statistics, Pearson Product Moment Correlation, ANOVA and Multiple Regression. Results: Findings showed that emotion regulation has a positive relationship with SOCIAL well-being. Also, age, emotion regulations and post-deployment stress as a whole significantly predicted SOCIAL well-being among the sampled participants. However, emotion regulation independently predicted SOCIAL well-being, though marital status did not significantly influence SOCIAL well-being among the participants. Conclusion: This study presented emotion regulation as a great predictor of SOCIAL well-being. It is recommended that; emotion regulation should be built into the training and debriefing of mobile police before and after deployment to aid their better SOCIAL well-being.