This study investigates smartphone overdependence among South Korean elementary school students and explores its prevalence and influencing factors. Participants in the study were 4th, 5th, and 6th graders of elementary schools living in Chungcheongnam-do province in Korea; 231 students agreed to participate in the study. Data were collected through face-to-face completion or via Google Forms questionnaires consisting of self-reports on gender, grade, family living together, location, time spent on a smartphone per day, days of smartphone use, age at first smartphone use, participation in smartphone prevention education, integrated smartphone overdependence, emotion regulation, peer relations, and school satisfaction