<![CDATA[Javanese culture, which emphasizes social harmony and politeness, often makes it difficult for individuals to express their opinions, which can ultimately affect their psychological well-being. This study aims to determine the relationship between assertiveness and six dimensions of psychological well-being in early adult Javanese individuals. This study uses a quantitative method with a correlational design to examine the relationship between assertiveness and psychological well-being. There were 202 early adult Javanese individuals participating in this study, selected using incidental sampling technique. The measurement tools used were the Alberti and Emmons assertiveness scale (α = 0.812) and Ryff's Psychological Well-Being Scale (α = 0.786). The results showed a significant positive relationship between assertiveness and all dimensions of psychological well-being, including (r = 0.571; p < 0.05), environmental mastery (r = 0.634; p < 0.05), personal growth (r = 0.675; p < 0.05), positive relationships with others (r = 0.684; p < 0.05), life purpose (r = 0.647; p < 0.05), and self-acceptance (r = 0.722; p < 0.05). These findings indicate that the higher an individual's level of assertiveness, the higher their psychological well-being. The results of this study emphasize the importance of developing assertiveness as an effort to improve psychological well-being in the Javanese cultural context ]]>
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