This study aimed to investigate the validity of the Eysenckian personality dimensions in 1,368 children and adolescents who completed the Greek Eysenck Personality Questionnaire-Junior (EPQ-J). Exploratory and confirmatory factor analyses were employed. Controversial issues regarding the Lie and Psychoticism scales were also investigated. Finally, the predictive validity of the EPQ-J was assessed using Goodman’s Strengths and Difficulties Questionnaire. Confirmatory factor analytic results supported the four-factor structure of the scale. Results provide support for the appropriateness of the EPQ-J with Greek speaking samples and add to the international literature regarding the three-factor model of personality in children and adolescents.