Passion can be uplifting and energizing; it can also be destructive and obsessive. The work realm represents a fertile ground to observe this duality of passion. This chapter provides a 10-year overview of the research on passion for work. The initial work on passion and its conceptualization is followed by a more focused presentation of the studies conducted in the workplace. First, various studies are presented that validate the concept of passion for work, distinguishing between harmonious passion and obsessive passion. Second, research that has examined the convergent and divergent validity of these two types of passion for work and their consequences on cognitive processes, psychological well-being, interpersonal relationships, and performance is discussed. Third, we present research on the determinants of passion, specifically the individual and social factors involved in the early and on-going development of passion for work. Finally, future research directions are proposed to stimulate new and exciting research in this growing field.