This monograph discusses the contributions of the designers orientated to the social dimension of sustainability. First, it starts with an exploratory study, showing some of the current discourses on sustainability and emphasizing the multiple meanings that this term can have depending on the context in which it is used. Retakes some of the historical references of social and environmental design and stresses the change that occurred in the field, emphasized by the transition in the use of the terms green design, eco design and sustainable design. It presents some authors who broach the social side of the latter. Subsequently it identifies the social aspects of sustainability within the Agenda 21, it selects relevant activities to design and classifies them according to eight classes (health, inequities, habitation, education, participation of the social groups, consumption, culture and natural disasters).