This paper provides an overview of aggression and violence in the Nigerian educational sector and its implications for integration and national development. The paper describes in detail what constitutes aggression and violence according to social-psychological research. It outlines the many forms aggression and violence can occur. It also looks at the probable causes of aggression and violence in the educational sector and its implications for integration and national development suggesting strategies to promote integration and national development. The paper concludes that basically, violent and aggressive tendencies can be controlled if the rightful measures are taken. Once violent and aggressive behavior is suppressed, the environment will be conducive for educational activities which will equip individuals with knowledge, skills, aptitudes, attitudes and values which will also influence integration and national development.