Data testing the effectiveness of third-wave interventions to decrease college students' test anxiety is sparse. We conducted a randomized controlled trial with college students to examine whether an intervention using several DBT skills (DBT; Linehan, 2015a, 2015b) would decrease test anxiety. Participants (N = 48) were randomly assigned to one of two conditions, the brief DBT condition (n = 26) or the control condition (n = 22), a brain-training activity group. Participants in both conditions met for a single, two-hour session. After the intervention, participants completed an exam in their psychology course. Results indicated that individuals in the DBT intervention group had greater reductions in levels of test anxiety and state anxiety, and greater increases in mindfulness, than individuals in the control group. This study provides data supporting DBT skills training as a promising treatment for students with test anxiety.