This study explored the predictors of continuing breastfeeding after returning to work. The primary independent variables of interest were demographics (age, working mother's education level, spouse's education level), employment characteristics (worksite, shift work, work hours per day), type of lactation room, breastfeeding-friendly policy (awareness of breast pumping breaks, using breast pumping breaks) and support (encouragement from colleagues, supervisors, and environment health nurses), and self-reported breastfeeding knowledge. The dependent variable in this study was continuing to breastfeed after returning to work. Working mothers were defined as continuing breastfeeding if they continued for at least 1 month after returning to work from maternity leave. Hence, working mothers who did not breastfeed at the beginning of maternity leave and breastfed for less than 1 month after returning to work were categorized as not continuing to breastfeed after returning to work and were treated as a reference group in the logistic regression analyses.