The purpose of this study is to examine the effect of fun at work on job satisfaction with work engagement as mediation variable. The analysis is formulated to find out the influence between fun at work and work engagement, fun at work and work satisfaction, and fun at work and work satisfaction with work engagement as mediation. Data were collected through surveys and conducted by distributing questionnaires to the company. The sampling technique used is a saturation sampling method, which all members of the population were used as the sample. The sample consisted of 65 respondents. Analysis method used in this research is Baron & Kenny Regression Analysis (1986). Some results can be derived from data analysis: First, Fun at work significantly affects work engagement. Second, Fun at work has effect on job satisfaction. Third, work involvement mediates between fun at work and job satisfaction.