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Prosocial behaviors at the workplace (PSBW) can be divided into two categories: pro-organizational behaviors and pro-individual behaviors. Among the variables linked to PSBW, the affective components of subjective well-being seem to play a determining role. The aim of this study was to find out whether organizational variables, affects, and personality have a predictive role in determining PSBW. One hundred and forty-eight employees filled out a questionnaire measuring PSBW, affectivity and satisfaction with life, organizational justice, organizational commitment, and personality traits. Correlation analyses indicated that emotional commitment was positively correlated with political prosociality, helping, and encouragement. Procedural justice, informational justice, and interactional justice were also found to be correlated with political prosocial behaviors. PSBW were best explained by commitment and affect. A regression analysis demonstrated the strong impact of affectivity, commitment, and organizational justice on prosocial behaviors.