Abstract Background The proportion of young age-onset breast cancer in Korea is relatively higher than Western countries. Young breast cancer patients are more likely to suffer from altered appearance due to cancer treatment such as breast disfiguration, hair loss, skin change and experience poor body image. This randomized controlled trial (RCT) is designed to evaluate the effect of mind and beauty education program on body image among breast cancer patients under 40-years old. Methods A total of 109 eligible breast cancer patients aged 18-40 years old, who had surgery and/or chemotherapy within 18 months and who reported poor body image (<66 EORTC QLQ-BR23 body image score) were recruited and randomly assigned to intervention and control group from July 2014 and April 2015 at an university-based hospital in Seoul, Korea. Intervention group received a structured 8 hours education (2 hours for 4 weeks, 1 hour for mind control and 1 hour for altered appearance management) and control group had education after outcome evaluation. Body image as primary outcome was assessed using both EORTC QLQ-BR23 and body image scale (BIS). In addition, socio-demographic characteristic, self-esteem, quality of life, anxiety, and depression were assessed. Outcomes were evaluated before the intervention, right after the intervention (visit 2), and 3 (visit 3) and 6 months (visit 4) after the intervention. T-test and intention-to-treat analysis performed to compare the outcomes of the two groups. Results A total of 54 and 55 patients were assigned to intervention and control group respectively with block randomization. Among the intervention group, 43 participants (79.6%) attended for more than 6 hours of education. Total 46 participants (85.2%) in intervention group and 53 participants (96.4%) in control group completed the questionnaire at visit 2. Mean age of the study population was 35.5 years old and there were 53 (48.6%), 32 (29.3%), 23 (21.1%) stage I, II, and III breast cancer patients respectively. At baseline, none of the socio-demographic, clinical, psycho-social characteristics were different between two groups. While there was no difference with the body image at baseline between intervention (57.69±20.57) and control group (53.09±26.98) (P=0.327), intervention group reported significantly improved body image than control group (EORTC QLQ-BR23 - Intervention; 71.69±20.27 and Control; 55.97±23.07, P<0.001). The results were similar with BIS measured body image (BIS - Intervention; 17.77±6.29 and Control; 21.29±6.94, P=0.012). Conclusion This study provided evidence supporting that mind and body education program would be beneficial to young women with breast cancer who would suffer from low body image. Active education program and psychosocial support related to altered appearance would help young breast cancer patients to make a smooth transit when they return to usual life. Trial registration: This study is registered in Korean Clinical Research Information Service (CRIS) with registration number KCT0001191. Funding: This study was supported by grants from Amorepacific. Citation Format: Lee JK, Cho J, Park SK, Kim I-R, Yoon J-H, Choi E-K, Cho S-Y, Lee S-K, Lee JE, Kim S, Nam S-J, Park YH, Ahn JS, Im YH. Effect of mind and beauty education on body image among young breast cancer patients: A randomized controlled trial. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P1-10-30.