Although previous research has demonstrated that procrastinators experience high levels of stress, less is known about why procrastination is linked to stress. This study is the first to investigate self-compassion as a mediator of the relationship between trait procrastination and stress. Across four samples (145 undergraduates, 339, undergraduates, 190 undergraduates, and 94 community adults) trait procrastination was associated with lower levels of self-compassion and higher levels of stress. A meta-analysis of these effects revealed a moderate negative association of procrastination with self-compassion. In all four samples, self-compassion mediated the relationship between stress and procrastination. These findings suggest that lower levels of self-compassion may explain some of the stress experienced by procrastinators and interventions that promote self-compassion could therefore be beneficial for these individuals.