From a functionalism perspective, the existing theory has suggested that the emotion of gratitude serves the functions of building, sustaining, and promoting high-quality social bonds between individuals. What is unclear, however, is how these social-relational functions of gratitude take place and are “realized” in everyday life. Addressing the question, step by step, I will introduce the audience to the recent work in my lab, on the interpersonal, the organizational, the cultural, and the interventional aspect of the social psychology of gratitude, with evidence collected using intensive longitudinal daily diaries, social network analyses, video-recorded naturalistic observations, in-lab as well as field experiments. I will also quickly point out some of my team’s current directions in this research program of gratitude.