Whereas previous studies have looked at the effectiveness of Mindfulness-Based Relapse Prevention (MBRP) on relapse rates, this study sought to investigate MBRP’s in cultivating mindfulness and decreasing impulsivity in substance abusers actively seeking recovery. This study investigated the effects of an 8-week MBRP intervention on the mindfulness and impulsivity of 14 substance users in recovery. A single group pretest-posttest correlational design was used comparing participants scores (n = 14) of mindfulness as measured by the Five Factor Mindfulness Questionnaire (FFMQ) and scores of impulsivity as measured by the Urgency, Premeditation, Perseverance, Sensation Seeking, and Positive Urgency Impulse Behavior Scale (UPPS). A series of 10 paired sample t-tests were performed on the pre and posttest mean scores of the variable constructs derived from the FMMQ and UPPS+P instruments. Results indicated significant increases in mindfulness scores pre to posttest for all five constructs (p < .005) and no significant decrease in pre to posttest scores of impulsivity for any of the five constructs. Additionally, two simple regressions were performed on the summed mean scores of the constructs for each of the two instruments to see if mindfulness was a significant predictor of impulsivity. The first simple regression showed significance, F (1, 12) = 6.47, p =.026, with R² of .350, (.296 adjusted) indicating that pre-intervention summed mean scores of the UPPS+P were predicted by the pre-intervention summed mean scores of the FMMQ. The second simple regression found inconclusive results, F (1, 12) = 0.02, p =.898, indicating no significant relationship in post-intervention summed mean scores of the UPPS+P and the FFMQ. Results suggest MBRP is effective at significantly increasing scores of mindfulness of participants but did not indicate a significant effect on scores of impulsivity.