According to data from Badan Pusat Statistik (Central Bureau of Statistics, 2018), more than 50% of the Indonesian workforce consists of millennials. This figure indicates that the world of work is increasingly being dominated by the millennial generation. Based on organizational psychology literature, person–organization fit is considered a key predictor of employee attitudes, including job satisfaction. In order to develop human resources capable of adapting to rapid changes, organizations must pay attention to the concept of person–organization fit, which refers to the alignment between employees’ abilities and job demands. When there is a good fit between the individual and the organization, employee job satisfaction tends to increase. Therefore, this study aims to examine the effect of person–organization fit on job satisfaction among millennial employees. A total of 324 millennial employees participated in this study, selected through purposive sampling. The instruments used were the job satisfaction scale (r = 0.921) and the person–organization fit scale (r = 0.870). Data were analyzed using simple linear regression, revealing a correlation coefficient (r) of 0.458 and an effect size of 20.9%, with a significance value of 0.000. The results confirm the research hypothesis and indicate that person–organization fit has a significant effect on job satisfaction among millennial employees. These findings suggest that organizations should foster alignment between individual values and organizational culture to enhance millennial employees’ satisfaction at work.