This chapter discusses some of the ethical issues that arise in developing and allocating effective health interventions in developing countries. It addresses two main ethical criteria for health resource allocation: (1) cost-effectiveness, which aims to maximize health benefits for a population given limited resources, and (2) equity in the distribution of benefits and costs among individuals and groups. The chapter also examines issues that arise in constructing cost-effectiveness analyses, such as whose preferences to use in evaluating health states and the quality of life with disabilities. Balancing cost-effectiveness and equity can be challenging when priorities conflict between the two criteria.