:The aim of this research are (1) To describe employees' Job Satisfaction, Job Involvement and OCB; (2) To know whether there is an effect toward job satisfaction to OCB; (3) To know whether there is an effect toward job involvemant to OCB. This study used quantitative research approach. The population in this reasearch were all employees of PT. Telekomunikasi Indonesia Tbk, East Java Region South Malang, with total 116 employees with the sample used as many as 90 employees. The research instrument using a likert scale and proportionate random sampling technique. Data analysis used multiple linear regression analysis. The results showed: (1) the level of job satisfaction and OCB included in extremely high category, and the level of job involvement included in high category. (2) Job satisfaction effect were positive and significantly on OCB; (3) Job Involvement effect were positive and significantly on OCB.