This chapter describes the use of evaluation advisory committees in contract and grant-funded evaluation projects. It defines what constitutes an evaluation advisory committee. It identifies five key functions of evaluation advisory committees: stakeholder engagement, maximizing external credibility, political conciliation, promotion of methodological integrity, and promotion of use. Typical features are explained: size, composition, meeting content, expectations for authority, and decision making. Whether to have an advisory committee is discussed. A range of examples—from fields of human services, public health, education, and others—illustrates the uses, functions, features, and compositional options of committees. ©Wiley Periodicals, Inc., and the American Evaluation Association.