--- - |2+ Abstract Objective A dearth of studies focusing on young women (<40 years) with breast cancer have hampered the understanding of the type, prevalence, and predictors of sexual dysfunction and reproductive concerns in this population. Methods Data were collected from 181 women (response rate = 60%) diagnosed with breast cancer approximately 2 years previously (age 21‐39) using the Swedish National Quality Registry for Breast Cancer and a survey including standardized measures of sexual dysfunction, reproductive concerns, body image, and health‐related quality of life. Multivariable logistic binary regression analyses were used to identify predictors of sexual dysfunction and reproductive concerns. Results Sexual dysfunction in at least one domain was reported by 68% of the women, and a high level of reproductive concerns in at least one dimension was reported by 58%. Model results showed that current endocrine treatment was a significant predictor of dysfunction related to lubrication (OR 3.8, 95% CI 1.2‐12.1) and vaginal discomfort (OR 8.7, 95% CI 1.5‐51.5). Negative body image was related to satisfaction with sex life (OR 1.1, 95% CI 1.0‐1.2). A high level of reproductive concerns was predicted by a wish for (additional) children in the future (OR 3.4, 95% CI 1.1‐10.2) and by previous chemotherapy (OR 2.5, 95% CI 1.1‐5.9). Conclusions Sexual dysfunction and reproductive concerns are common in young women with breast cancer. Current endocrine treatment, previous chemotherapy, a negative body image, and a wish for children in the future predict higher level of problems. - Psycho-Oncology, EarlyView.