This study aims to analyze the effect of personality on organizational commitment mediated and moderated by deviant behavior and employee engagement. The study was conducted at PT. Smartfren Telecom, Tbk in Malang City, involving 105 respondents of frontline employees and the collected data were proceed using Partial Least Square (PLS) analysis. The finding shows that personality did not affect the enhancement of employee's organizational commitment directly. Instead, personality was able to indirectly affect organizational commitment through engagement and a good personality will decrease deviant behavior. While deviant behavior itself did not influence organizational commitment, neither mediate nor moderate the relationship between personality and organizational commitment. Meanwhile, employee engagement was able to mediate the influence of personality toward the organizational commitment, but not to moderate the relationship between the two variables. The study places deviant behavior, and employee engagement were used as the mediating and moderating variables on the effect of personality on the organizational commitment of frontline employees. The highlight of this study is that deviant behavior was not able to act as both the mediating and moderating variable on the influence of personality on organizational commitment.