Procrastination is a personality tendency with several deleterious consequences. Trait mindfulness has been found to be associated with procrastination. Nevertheless, the relationship between trait mindfulness and procrastination has yielded inconsistent results in previous studies. Therefore, by utilizing a three-level random-effects meta-analysic model, the present study synthesized previous studies to investigate the relationship between trait mindfulness and procrastination and explore the potential moderators that may affect this relationship. A significant and negative relationship between trait mindfulness and procrastination (r = −0.365; p < 0.0001) was found by analyzing 36 effect sizes from 19 studies with 14,094 participants. The subsequent moderator analysis did not reveal any significant moderators. Overall, the current meta-analysis shed insightful light on information for future research on reducing procrastination by considering utilizing mindfulness-based interventions that make it easier for individuals to maintain a mindfulness state and enhance trait mindfulness, thereby reducing procrastination.