Obesity is an epidemic with enormous health, economic and social burdens. Current drugs for obesity treatment are far from ideal in terms of efficacy and side effects. Reviews in this volume of Progress in Molecular Biology and Translational Science summarize current status in studies of a number of G protein-coupled receptors that were shown to be promising targets for obesity treatments. Some of these receptors also cause monogenic obesity in humans. Subject matter: obesity is an epidemic and G protein-coupled receptors are promising drug targets, with significant potential as new anti-obesity drugs. Chapters are written by leading experts.