This study examined the effects of Korean language levels and years of residence in Korea of marriage-immigrant mothers on their parenting behaviors. It also examined the mediating roles of parenting knowledge and acculturation patterns. To do this, this paper made use of data collected from 130 mothers participating in Multicultural Family Support Centers. The main findings are as follows. First, parenting knowledge did not mediate Korean language levels as well as years of residence in Korea and parenting behaviors. Second, years of residence in Korea indirectly affected parenting behaviors through the acculturation patterns of integration and assimilation but did not appear to do so directly. Third, Korean language levels did not have a linear relationship with acculturation. Fourth, higher Korean language levels were correlated with higher levels of overprotection of children.