This study focuses on An-Nadzir, a non-mainstream Islamic movement in Indonesia. Political openness in Indonesia, a country known for its majority Muslim population, since the initiation of reform in 1998 has significantly influenced the development and survival of such socioreligious movements, as demonstrated in the rise of numerous social movements based on religion. This study is a qualitative one, employing participant observation and in-depth interview techniques to collect data. The presence of An-Nadzir in Indonesian society confirms the existence of diversity in Indonesian religious movements and suggests that such movements encompass not only mainstream Muslim communities, but also non-mainstream ones. An-Nadzir position as a non-mainstream Islamic movement can be seen in its religiosity, values and norms, and religious gatherings and practices.