Objective: This study compared the effectiveness of mindfulness coloring (mandala), free drawing/coloring, and a noncoloring control activity for university students' test anxiety, and assessed the relationship of dispositional mindfulness and response to intervention on mindfulness and test anxiety states. Participants: University students (n = 167; 81.4% female; M[subscript age] = 21.29 years, SD = 4.46) were randomly assigned to a mandala (n = 57), free draw/coloring (n = 58), or noncoloring condition (n = 52). Methods: Participants completed standardized measures assessing test anxiety and state mindfulness pre-postactivity before completing a test, and two dispositional mindfulness measures. Results: Participants in both coloring conditions reported significant decreases in test anxiety and significant increases in state mindfulness pre-postintervention, and participants in the control condition reported significant increases in test anxiety. Reports of preintervention state mindfulness and test anxiety fully mediated relations between dispositional mindfulness and postintervention state mindfulness and test anxiety. Conclusions: Implications for research and practice on mindfulness coloring and test anxiety are discussed.