Sport nostalgia, characterized by the sentimental longing for past sporting experiences, has gained traction in the sport industry as a powerful tool for enhancing fan engagement and brand loyalty. Despite its growing application in marketing strategies, academic research on sport nostalgia remains underdeveloped, particularly in understanding its psychological and emotional impacts. This study explores the connection between sport nostalgia and eudaimonic well-being, which reflects an individual’s sense of purpose, self-actualization, and fulfillment. Guided by two research questions, the study investigates whether personal nostalgia (rooted in direct experiences) and vicarious nostalgia (stemming from shared or imagined experiences) influence eudaimonic well-being. Using an experimental design, participants were exposed to a nostalgia-inducing sport experience, followed by an assessment of their well-being levels. Preliminary findings suggest that both personal and vicarious nostalgia positively impact eudaimonic well-being, fostering emotional resilience, social connectedness, and optimism. This study contributes to sport management literature by bridging the gap between sport nostalgia and well-being, offering theoretical insights and practical implications for sport marketers. By leveraging nostalgic elements, sport organizations can deepen emotional connections with fans, enhance consumer satisfaction, and promote overall well-being, ultimately strengthening their brand-community relationship.