Thriving encompasses excelling and reaching one’s full potential. In the context of L2 education, thriving reflects a state where bilinguals and multilinguals not only achieve linguistic proficiency but flourish across various life domains, leading to fulfilling and successful lives. Building on the previous discussion of “positive second language being” (PSLB), which highlighted the individual and societal benefits of bilingualism and multilingualism, this chapter explores how L2 teachers and learners thrive within diverse cultural contexts. By examining the interplay between well-being and L2 education, in this chapter, we identify factors that influence well-being at social, cultural, institutional, classroom, and personal levels. Additionally, we review approaches to conceptualizing and measuring well-being in L2 education. Practical insights are provided to help L2 teachers and learners enhance their well-being and achieve a state of thriving in different cultural settings. This chapter underscores the importance of integrating positive psychology principles into L2 education to foster holistic growth and success for both teachers and learners.