The purpose of this chapter is to examine how language barriers contribute to health disparities among ethnic and racial minorities in the United States. A literature search was systematically conducted using selected computer databases (MEDLINE and CINAHL). Searches were limited to English-language-published research in the years from 1985 to 2003. A total of 47 published articles were included in this review. Overall these studies indicate that language barriers are associated with longer visit time per clinic visit, less frequent clinic visits, less understanding of physician's explanation, more lab tests, more emergency room visits, less follow-up, and less satisfaction with health services. The results also indicate that people who are older, poorer, and female tend to have severe language barriers compared to those who are younger, wealthier, and male. Improvement of communication between patients and providers in relation to health disparity consists of cultural competency and communication skills. Implications of these studies for practice and further research are outlined.