A service-learning project was conducted with counselors-in-training to increase self-efficacy for interacting with individuals with unique abilities/intellectual disabilities. Counselors-in-training (N=27) completed a semester-long service-learning project and took a pre and post assessment. The results indicated that self-efficacy improved for all counselors-in-training. The paired samples t-test identified that the mean increase in self rated self-efficacy was statistically significant with a medium to large effect size, t (26) = - 4.052, p < 0.001, d = 0.742. However, the increase of self-efficacy was greater among the counselors-in-training who had no prior experience with individuals with unique abilities/intellectual disabilities.