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Currently, many lecturer positions have been filled by millennials. Even in 2025, the number of millennial workers will reach 75%, meaning that three out of four will be millennials. Previous studies have shown differences in the work values of the millennials and previous generations. This difference in work values will make millennial workers avoid organizational citizenship behaviour (OCB), even though OCB is a significant indicator of organizational performance. This study examines the meaningfulness of work and self-efficacy in OCB through engagement with millennial lecturers. This quantitative research involves 246 millennial lecturers in Indonesia as research subjects. Data collection was carried out with the help of electronic devices and using the OCB scale, Utrecht Work Engagement Scale (UWES), lecturer self-efficacy and work and meaning inventory (WAMI). The results of this study indicate that work engagement significantly mediates the effect of the meaningfulness of work on the OCB of millennial lecturers. Work engagement does not mediate the effect of self-efficacy on millennial lecturer OCB. The results of this study can be used as material for theoretical studies and as an intervention framework to improve OCB in millennial lecturers.