Objective: The present study aimed at an investigation of the effectiveness of the mindfulness training on test anxiety in Kashan guidance grade boy students. Method: The present study is experimental with pre-test – post-test with the control group. The statistical population of the present study includes all of the guidance grade boy students in the academic years of 1394 in Kashan among whom 40 subjects were, randomly selected in sampling methods. The measurement instruments in the present study were of test anxiety questionnaire of Spielberger. Questionnaire pre-test, post-test, and follow-up were used. Results: Statistical analysis of covariance showed that the hypothesis of the present study was based on a 99% level of confidence is significant. Conclusion: It is concluded that mindfulness training is effective in reducing anxiety.