Young adulthood is a stage of life characterized by significant personal growth and professional development. Personality is the dynamic organization within the individual of those psychophysical systems that determine his characteristics behaviour and thought, personality dimensions are extroversion, agreeableness, conscientiousness, neuroticism and openness to experience. Trust is the state involving confident positive expectations about another's motives regarding oneself in situations of risk. Attachment is the deep emotional connection between two people, the dimensions of attachment are close, depend and anxiety. The objectives of the study were to examine the connection between personality, trust and attachment among young adults. 200 young adults of age 18-25 made up the sample, which included both males and females. Short version of the Big Five Inventory (BFI‐10), Trust in Close Relationships Scale and Revised Adult Attachment Scale (RAAS) were the instruments employed. The data was examined using the Spearman's correlation test. According to the study, there is no significant correlation between personality dimensions and trust in romantic relationship. And there exists a positive correlation between personality factor extroversion and attachment subscale close and there exist a negative correlation between personality factor neuroticism and attachment subscale close. And there exist a positive correlation between personality factors extroversion and agreeableness with attachment subscale depend, also there exist a negative correlation between personality factor neuroticism and attachment subscale depend. And also there exist a positive correlation between the personality factor depend and trust.