This paper examines research that can inform policies aimed at building the capacity of early care and education programs to promote parent engagement in linguistically diverse families. The key questions addressed include: 1) What factors affect linguistically diverse families' access to early care and education programs?; 2) What do we know about linguistically diverse families and how parents in these families support their young children's learning and development?; 3) What features of early care and education programs appear to contribute to high levels of parent engagement in linguistically diverse families?; and 4) What policies can help increase the capacity of early care and education programs to support parent engagement in linguistically diverse families?