Abstract: This quantitative study explores the relationship between assertiveness and self-esteem among young Indian adults aged 20 to 30 years. The research design employs a correlation approach to examine the statistical association between assertiveness and self-esteem without manipulating variables. The study aims to answer key questions regarding gender differences in assertiveness and self-esteem, the relationship between assertiveness and self-esteem, and the impact of self-esteem on assertiveness. Data from 131 participants (61 males, 70 females) from Assam and Karnataka were collected using Google Forms and social media advertising. The Rathus Assertiveness Schedule (RAS) and Rosenberg Self-Esteem Scale (RSES) were used to measure assertiveness and self-esteem, respectively. Statistical analyses included independent sample t-tests, correlation analysis, and regression analysis. The results indicate no significant difference in assertiveness and self-esteem between males and females. However, a significant negative correlation was found between assertiveness and self-esteem, suggesting that as assertiveness increases, self-esteem tends to decrease, and vice versa. Regression analysis further confirms that self-esteem significantly impacts assertiveness among young adults, with approximately 8.9% of the variability in assertiveness scores explained by differences in self-esteem. These findings provide valuable insights into the dynamics of assertiveness and selfesteem among young Indian adults, highlighting the complex interplay between these psychological constructs and their implications for individual well-being and behavior.