The purpose of this research was to examine the validity of an adult attachment style questionnaire, to understand the relationships between the type of attachment style in relation to self-perceived stress and social support, and to investigate the influence of gender, ethnicity and religion on the above constructs. The participants were 308 university students from Malaysia. A demographic questionnaire and three self-report inventories were administrated in this study. The data indicated that the Relationship Scales Questionnaire (RSQ) is a multidimensional construct with nine factors: “dismissing,” “preoccupied with romance,” “preoccupied with close relationships,” “fearful,” “preoccupied with dependency,” “secure emotional,” ”comfortable depending,” “preoccupied with mistrust” and “mutual secure.” Different attachment styles were positively or negatively correlated at a significant level with perceived stress and social support. Attachment styles were explained by 20 and 33% of the total variance in self-perceived stress and perceived social support, respectively. There were significant gender, ethnic and religious differences in attachment styles, perceived stress and social support.