Gender denotes the social prescriptions associated with biological sex in regard to roles, behaviour, appearance, cognition, emotions, and so on. Social relations of gender or gender relations encompass all relationships in which gender subjectivities play a role, including those among people, and between people and the institutions, systems, and processes of development. The chapter describes three features of gender relations that are generally consistent across societies – gender ideologies and myths; gendered division of labor; and unequal power relationships – and discusses their implications for development. The chapter further explains the centrality of gender to the development enterprise and discusses various approaches to integrating gender analysis in development processes.