This research is a kind of quantitative research that is by using mathematical model which depart from theory toward data resulting from an object. The purpose of study was to analyze the effect of employee engagement on employee performance with a organizational commitment as an intervening variable. The subjects of this research is employees of PT. Tiga Manunggal Textil of Salatiga. Sampling technique in this research is census that is data obtained from entire population amount. Method of taking data by using instrument that is questioner wich contains 44 statement. Respondents in this study amounted 150 employees in the production section. Data analysis using Structural Equation Modeling (SEM) with AMOS program as its analytical tool. The results of this study indicate that employee engagement affects organizational commitment, organizational commitment affects performance, then employee engagement has an effect on performance. Furthermore, organizational commitment cannot mediate the influence of employee engagement on performance.