This research aims to find the correlation between narcissism and selfie-posting behavior on Instagram among Millennials. Millennials, those who were born between 1982 and 2004, known to be more selfish and low in empathy compared to the previous generation (Firestone, 2015) and they post their selfies more often (Pew Research Center, 2014). The narcissism variable is measured using Narcissism Personality Inventory 13 from Gentile et al. (2013) which has been translated into Indonesian language, meanwhile the selfie-posting behavior is measured using selfie-posting frequency in a month and Motivations for Posting Selfies on SNSs Scale (MPSS) from Sung et al. (2016) which also has been translated into Indonesian language. This research is being conducted to 443 young people aged between 16-24 who are active Instagram users in Indonesia. Based on the correlation test, there is a significant correlation between narcissism and selfie-posting behavior (r=.187-.721), in which the higher one's score is in narcissism, the more selfies one takes.