Mindfulness, an ancient spiritual practice, is becoming an increasingly popular component of communication courses, training individuals to reserve judgment in their dealings with others. However, the effects of mindfulness in communication courses are not well researched. We compared students taking an introductory communication course that included a mindfulness component (N = 20) against a control group of students taking an equivalent course without mindfulness content (N = 24). Both groups improved in their positive reappraisal tendencies following communication training; however, the groups appeared to differ in how they positively reappraised situations. Only the mindfulness group demonstrated improved mindfulness scores following training, accounting for that group's increases in positive reappraisal, and providing evidence for mindfulness training as one mechanism for reducing negative reactivity in communication. (Contains 2 tables and 1 figure.)