Purpose: This study aimed to analyze the influence of financial literacy and lifestyle on financial well-being among Generation Z (Gen-Z), with locus of control as a mediating variable. In this study, locus of control refers to an individual's belief in internal and external influences in making decisions or taking actions, which is expected to mediate the relationship between financial literacy, lifestyle, and financial well-being. Research methodology: The data used in this study were collected through a survey of students, teachers, and staff members of Gen-Z at Tri Ratna School-Jakarta, aged between 16 and 27 years. The analysis was conducted using Partial Least Structural Equation Model (PLS-SEM) analysis to test the relationships between variables. Results: The findings of this study are expected to provide insights into the importance of financial literacy and the influence of lifestyle in shaping the financial well-being of Gen-Z as well as the role of locus of control in strengthening or weakening these influences. The findings are expected to serve as a reference for financial education and the development of more effective policies to improve the financial well-being of younger generations in Indonesia, particularly Tri Ratna School-Jakarta.