Wiley-Blackwell’s Handbook of Jealousy presents an informative and integrated portrait of the emerging areas of research in the development of jealousy during early childhood and across the lifespan, as well as a forum for discussing the implications of these findings for theories of emotional and socio-cognitive development. This carefully chosen compilation of 23 interdisciplinary articles captures the process by which jealousy unfolds by exploring familial, cultural, cognitive, and biological factors that drive its presentation and developmental trajectory. A distinguished group of authors address a variety of relevant topics stimulated by recent empirical advances in developmental psychology. Original empirical papers based on new discoveries are included, along with intriguing theoretical papers and commentaries that address factors which influence or help explain jealousy’s appearance and meaning. The articles also integrate new findings within extant psychological literature on a variety of topics and carve out numerous new questions for stimulating further research. Journeying deep into the recesses of the human mind, the Handbook of Jealousy provides rich and profound insights into a powerful and universal emotion.