In this article we introduce Positive Psychology (PP), a relatively new subfield of psychology, and outline its development since the year 2000. We describe ways in which PP represents an exciting addition to the Second Language Acquisition (SLA) literature and the ways it is already influencing trends in education generally, thus creating promising expectations of its impact on language teaching and learning. After reviewing the progress made thus far under the rubric of PP in SLA, we offer suggestions for an agenda to move forward with theory, research, and practice.