According to Self-Determination Theory (SDT), satisfaction of needs for autonomy, competence, and relatedness is a universal requirement for psychological well-being. We tested this hypothesis with college students in the United States, Australia, Mexico, Venezuela, the Philippines, Malaysia, China, and Japan. Participants rated the extent to which these needs, plus needs for self-actualization and pleasure-stimulation, were satisfied in various roles and reported their general hedonic (i.e., positive and negative affect) and eudaimonic (e.g., meaning in life, personal growth) well-being. Asian participants averaged lower than non-Asian participants in perceived satisfaction of autonomy, competence, and self-actualization needs and in most aspects of eudaimonic well-being and these differences were partially accounted for by differences in dialecticism and independent self-construals. Nonetheless, perceived need satisfaction predicted overall well-being to a similar degree in all cultures and in most cultures provided incremental prediction beyond the Big Five traits. Perceived imbalance in the satisfaction of different needs also modestly predicted well-being, particularly negative affect. The study extended support for the universal importance of SDT need satisfaction to several new cultures.NEED SATISFACTION AND WELL-BEING 5 Self-Determination Theory (SDT) proposes that certain evolved psychological needs must be satisfied if individuals are to develop to their fullest potential, in the same way that plants require key nutrients to thrive (Deci & Ryan, 1985Ryan, 1995;. SDT posits three universal needs: autonomy, competence, and relatedness. Autonomy involves the need to experience one's behavior as freely chosen and volitional, rather than imposed by external forces. Competence involves the need to feel capable and effective in one's actions. Relatedness involves the need for belonging, intimacy, and connectedness to others.SDT theorists view these needs as broad motivational tendencies that operate across life domains and contend that satisfaction of all three needs, not just one or two, is essential for well-being.Although the expression or means of satisfying these needs may vary across cultures, their satisfaction is viewed as essential for well-being in all cultures.In contrast, some critics of SDT have questioned whether these needs are cultural universals. In particular, several scholars have argued that autonomy is more valued or normative in individualistic or Western cultures (Cross & Markus, 1999;Iyengar & Lepper, 1999;Miller, 1997). However, as noted by Chirkov and Ryan (2001), the existence of cultural differences in the strength of autonomy values does not preclude similarities in the functional impact of autonomy-supportive versus controlling environments. Furthermore, SDT theorists counter that critics tend to confuse autonomy as defined by SDT with independence or individualism (Chirkov, Ryan, Kim, & Kaplan, 2003). For example, behaving in accordance with group norms might be internal...