In Cambodia, as in many ASEAN countries, private supplementary tutoring, also known as 'shadow education,' is a significant component of the educational landscape. This chapter examines the root causes of shadow education in Cambodia, the challenges it poses, and the effectiveness of existing policies aimed at regulating this sector. Through semi-structured interviews with 21 principals and teachers, the study identifies key drivers of shadow education, including inadequate formal education, insufficient resources, regulatory gaps, and teachers’ low salaries. The findings indicate a widespread reliance on private tutoring to compensate for these deficiencies, which exacerbates educational inequalities. The chapter concludes with targeted recommendations for students, parents, educators, and policymakers, underscoring the critical need for robust and effective regulatory frameworks to address the challenges of shadow education and to enhance the quality and equity of Cambodia's educational system