Johannes Quack (born 1959) is a German ethnologist at the Goethe University Frankfurt whose primary field of study is religion. He is also the head of the Emmy Noether Research Group “Diversity of Non-Religiosity” at the Goethe University Frankfurt. He has researched non-religious and rationalist organisations in India. He received the Max Weber Award from the Max Weber Center for Advanced Cultural and Social Studies at the University of Erfurt for his work Disenchanting India: Organized Rationalism and Criticism on Religion in India.