The recent surge in workload in the health sector has raised serious concerns, particularly regarding the welfare and productivity of medical personal. Amidst this situation, Yasyfin Darussalam Gontor Hospital, as a new institution based on Islamic values, faces a dilemma: how to maintain stable employee performance while creating a healthy and attractive work environment. This challenge is not merely technical, but also touches on the human aspect of resource management. This study examines the impact of WLB and EE on EP at Yasyfin Gontor Hospital, with OCB as a mediating variable. This quantitative study took a random sample of 130 employees (medical and non-medical). Data were collected through structured questionnaires and analyzed using the Partial Least Square (PLS) method with Smart PLS 3.2.9 software. The results of the study indicate that WLB has a significant influence on EP and OCB. EE also has a significant influence on EP and OCB. In addition, WLB and EE are proven to have a significant indirect influence on EP through OCB, while OCB itself has a strong influence on EP, confirming its role as a mediator. These findings confirm that creating WLB and increasing EE can encourage positive extra-role behavior (OCB), which ultimately improves employee performance. Therefore, Yasyfin Gontor Hospital is advised to strengthen its WLB policies and develop EE strategies in line with Islamic values in order to build a productive, committed workforce that makes a sustainable contribution to the organization.