Purpose: This study aims to investigate the relationships between high-performance work systems (HPWS) on knowledge-sharing behavior (KSB) among Indonesian employees through the mediating role of feeling trusted (FT) and moderating role of generational differences (GD). Design/methodology/approach: Sample were collected from 278 employees working in the Indonesian financial companies. This research used structural equation modeling to investigate the associations of HPWS and KSB. Furthermore, Sobel Test was applicated to test the mediation effect of FT. Finally, Hayes PROCESS was used to test the moderation impact of GD. Findings: The empirical results revealed that HPWS positively impact FT and KSB. Hereafter, FT also positively impacts KSB and then succeeds to mediate the relationships between HPWS and KSB. Finally, GD were failed to moderate the relationships between HPWS and KSB. Originality/value: To the best of the authors' knowledge, this study is one of the few studies that illustrate the roles of GD between the relationships between HPWS and KSB.