This study examines the effect of financial knowledge, financial behavior, and financial inclusion on financial well-being. The sampling method used in this study was purposive sampling with a total sample size of 509. We collected data using an online questionnaire distributed via social media in Sumatra, Indonesia. Data were examined using the Partial Least Square (PLS) technique. The results showed that financial knowledge, financial behavior, and financial inclusion had a positive effect on financial well-being. We also found that financial behavior and financial inclusion mediate the influence of financial knowledge on financial well-being.