This study aims to investigate the effect of Islamic work ethics and knowledge sharing behavior to organizational citizenship behavior and its impact on employee performance. The study uses two-stage sampling – purposive sampling and simple random sampling. The data is analyzed using structural equation modelling (SEM) AMOS 21. The study shows that Islamic work ethics has a significant effect on organizational citizenship behavior; whereas it does not have a significant effect on IMFIs employee performance. Knowledge sharing behavior affects significantly to IMFIs employee performance; however, it does not contribute significant effect on organizational citizen behavior. Organization citizenship behavior has a significant effect on employee performance.