Marriage holds social significance and plays a vital role in individual well-being and societal structure. Objective: To investigate how gratitude moderates the relationship between marital satisfaction and the psychological well-being of couples. By exploring this moderating role, the study aimed to enhance our understanding of the complex dynamics between these variables. Method: A total of 400 married couples (200 wives and 200 husbands) from Wah Cantt were included in the sample, selected using purposive sampling techniques. From June 2022 to August 2022, the selected participants were administered a reliable set of measures, including scales for marital satisfaction, psychological well-being, and gratitude. Results: The study employed correlational and hierarchical regression analyses to analyze the data. The results demonstrated a substantial positive correlation between marital satisfaction and psychological well-being (r = .68**). Additionally, the findings provided evidence for the moderating influence of gratitude in the association between marital satisfaction and psychological well-being (R2 = 0.29, F = 21.47***). Conclusions: This study highlights the significant role of gratitude as a moderator in the connection between marital satisfaction and the psychological well-being of couples. The findings provide valuable insights into the intricate dynamics of marital relationships and emphasize the importance of cultivating gratitude within the context of marriage. These results contribute to the existing body of knowledge and have implications for interventions and strategies aimed at promoting marital satisfaction and enhancing the psychological well-being of couples..