The relationships of some important environmental (perceived organizational justice, interpersonal conflict at work, and organizational constraints), attitudinal Gob satisfaction), personality (neuroticism, openness, extroversion, agreeableness, conscientiousness, trait anxiety, and trait anger) and affective (positive and negative affects) variables with counterproductive workplace behaviors were investigated. Five-hundred and forty six employees were randomly selected. Results indicated that four types of organizational justice (including distributive, procedural, interpersonal, and informational), job satisfaction, extraversion, agreeableness, conscientiousness, and positive affects were negatively correlated with both organizationally and interpersonally counterproductive workplace behaviors. Moreover, interpersonal conflict at work, organizational constraints, neuroticism, trait anxiety, and trait anger were correlated positively. Hierarchical regression analyses revealed that predictor variables account for 24 and 39 percent of variance of interpersonally and organizationally counterproductive workplace behaviors, respectively. Moderated regression analyses showed that personality characteristics (trait anxiety and anger, agreeableness, and conscientiousness) moderated the relationships between environmental variables (interpersonal conflict and distributive justice) and counterproductive behaviors.That is, the relationships between environmental variables and counterproductive behaviors were stronger for individuals high in trait anxiety and anger and low in agreeableness and conscientiousness than for individuals low in trait anxiety and anger and high in agreeableness and conscientiousness. Inconsistent with expectations, personality characteristics did not moderate the relationships oforganizational constraints and counterproductive behaviors.