The general aim of the present study was to determine the effectiveness of acceptance and commitment therapy on FEELINGS of INFERIORITY, fear of body image, and feeling of self-worth in cosmetic surgery applicants. The current research is fundamentally applied in terms of its purpose, and semi-experimental in terms of design. It was a pre-test-post-test design with a control group. To collect data from the demographic checklist, the Multidimensional Self-Body Relationships Questionnaire (MBSRQ), the INFERIORITY Scale, and the Contingencies of Self-Worth Scale (CSWS) were used. The population under study included 58 people who visited the cosmetic surgery clinic in Mahabad city in 1401 for cosmetic surgery during a period of one month. The sample size in this research was 12 people in the control group and 12 people in the experimental group. The sampling method was convenience sampling. The experimental group (8 sessions of 45 minutes) underwent acceptance and commitment therapy, and the control group did not receive any treatment. The analysis showed that the components of self-worth, feeling of INFERIORITY, and fear of body image of the experimental groups (the group that was exposed to the treatment method of acceptance and commitment) in the post-test are significantly different from the control group. The eta square indicated that a high amount of the variance of the components of self-worth (24.6%), feeling of INFERIORITY (73.3%), and body image (36.2%) can be explained by the treatment method of acceptance and commitment. The results showed that acceptance and commitment therapy is effective on feeling of INFERIORITY, fear of body image and, feeling of self-worth. Based on these findings, it is recommended to use this method to reduce the fear of body image and feeling of INFERIORITY, as well as increase self-worth in people applying for cosmetic surgery.