The purpose of this study was to identify the variables affecting parenting efficacy of North Korean refugee mothers. The selected variables were marital satisfaction, social support, and acculturation. The participants consisted of 105 mothers who had defected from North Korea with preschool children living in Seoul, Gwangmyeong-si, and Gyeongsangnam-do provinces. The data thus collected were analyzed by descriptive statistics, t-tests, correlation, and multiple regression analysis. The results indicated that the marital satisfaction and social support had meaningfully positive effects on the parenting efficacy of North Korean refugee mothers. However, marginalization was found to be a predictor of competence-anxiety in parenting. The selected variables derived from the environmental systems in maternal parenting were significant factors in the parenting efficacy of North Korean refugee mothers and furthermore, their sociocultural environments were also important in parenting. These findings clearly showed that marital satisfaction and social support were the most significant variables of parenting efficacy of North Korean refugee mothers. The results of this study appear to have a great deal of utility as preliminary data to improve the parenting efficacy of North Korean refugee mothers.