Timothy Miller (born 1944) is an American scholar, author, and social activist known for his work in religious studies, particularly on New Religious Movements (NRMs). He served as a professor of religious studies at the University of Kansas and wrote extensively on American religious pluralism, utopian communities, and alternative spiritual movements. His research focuses on religious innovations since the 1960s, including the counterculture, New Age, and Eastern religions in the West. His book 'Utopian Communities in American Religion' is considered a classic in the field. Miller also advocates for religious freedom and intercultural dialogue.