This study contributes to the cyberpsychology literature by investigating the moderating effect of gender in the relationship between narcissism and selfie posting behavior. A demographic questionnaire, 13-item selfie-posting scale developed and validated in the present study, and Narcissistic Personality Inventory (NPI-16) were used to collect data. An EFA was conducted to test the factor structure of scales based on data collected from 179 young adults (age 18-27 years). A CFA was then conducted using data from 269 university students (age 18-32 years) to test construct validity of the scales. A correlation analysis was employed to test the correlations between narcissism and selfie posting behavior. The results indicated that the correlations between attitudes, intentions, behaviors, and narcissism are significant for men, but not for women. The results also indicated gender differences in online behavior with women spending more time on social media and selfie-posting.