Thriving, or the concurrent experience of healthy well-being and high-level performance, may serve as a valuable construct when studying the optimal student-athlete experience and mindfulness-based interventions (MBIs) have been shown to positively impact well-being and performance. The purpose of the present study began to examine the impact of an MBI for improving student-athlete experiences of thriving via a quasi-experimental longitudinal design. NCAA Division II student-athletes (n= 55) from three sports were randomly assigned to either a control or a 7-session MBI. While comprehensive measures of thriving did not yield significant change for those in the MBI relative to the control, multiple thriving characteristics and outcomes were improved. MBI participants reported quantitative significant improvement for subjective performance satisfaction, mindful awareness, and the use of mindfulness to regulate emotions. Exploratory analysis revealed those in the MBI, relative to the control, experienced improvements of optimism and a sense of meaning and purpose. Within the program evaluation, student-athletes qualitatively reported sport and life benefits related to thriving (e.g., self-regulation, focus, awareness, vitality, intentional actions) while also suggesting improving MBIs with systematic reminders to meditate, more meditation opportunities within the sport environment, and autonomy-supportive instruction. These preliminary data support the use of MBIs to facilitate characteristics and outcomes of thriving, while also offering suggestions for practical improvements when implementing MBIs with student-athletes. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]