The act of terrorism stimulated by the notion of radicalism in Indonesia is not a new phenomenon. It has indeed existed since the beginning of Indonesia's independence; The forms, actors, motives, and movements radicalism are, however, different. Recently, there has been a growing discourse on radicalism among young Indonesians. This study investigated the relationship between four social factors, namely, religiosity, religious tolerance, relative deprivation, and social capital (independent variables) and the intensity of radicalism among school students (dependent variable) in Lampung, Indonesia. Three public schools and three madrasas were taken as research samples. Data were collected using a questionnaire based on the extant literature and analyzed using chi-square and correspondence analysis. Each variable was found to have a relationship pattern with the intensity of student radicalism. The analysis revealed that two social factors, namely, religiosity and religious tolerance, had the strongest relationship with the intensity of radicalism. To reduce the impact of the intensity of radicalism, it is very important for the world of education to exercise social control over the relative backwardness of high school/"Madrasah Aliyah" students and provide social capital through an effective understanding of socialization process in schools. The expected implication is that the government, especially stakeholders in the education sector, must pay attention to the concerns of students as victims of radicalism and focus on the social factors and drivers of the intensity of radicalism so that students do not fall prey to radicalism.