Research Findings: Previous research has suggested that children from immigrant families face multiple stressors associated with acculturation. One component of acculturation that has not been widely explored in relation to children's socioemotional development is limited English proficiency (LEP). Given that English is the main language used in American schools, it is important to understand how LEP can affect the socioemotional development of children from immigrant families whose 1st language is not English. This study explores the effects of LEP on the socioemotional development of 5,268 Hispanic and 2,088 Asian American children from the Early Childhood Longitudinal Study data set (first 3 waves of data). Results from generalized estimating equation analyses revealed significant interactions between ethnicity and language status. English-proficient Asian American children fared better than Hispanic children, but Asian American children with LEP lagged behind their Hispanic counterparts in their approaches to learning, self-control, and interpersonal skills at the beginning of kindergarten. These ethnic differences disappeared by the end of 1st grade. Practice or Policy: Our findings suggest that language-related challenges among minority children may be more consequential for young Asian American children, who would benefit from additional efforts to help them attain proficiency in English.