This paper reviews and summarizes extant research into auditor concentration, audit quality, and the determinants of audit fees in audit markets outside the United States. Similarities and differences between studies, including methodologies and findings, are discussed. The review identifies some structural differences in audit markets between studies that are traceable to divergences in economic, cultural and social norms across developed and developing nations. The paper concludes with the identification of areas where future research may be most helpful in identifying other differences and similarities in international markets for audit services.