William Keil (March 6, 1812 – December 30, 1877) was the founder of communal religious societies in Bethel, Missouri, and Aurora, Oregon, that he established and led in the nineteenth century.
Influenced by German Lutheranism, pietism, and revival Methodism, Keil's theology was based on the principle of the Golden Rule as well as the view that people should try to share all with others by living communally (Acts 4:32-37).
Keil was born in Prussia March 6, 1812 and raised by German Lutheran parents. He emigrated to the United States as a young man—apparently after receiving a mystic text from a gypsy. Initially he settled in New York and worked as a tailor, his family trade. Within a year, he and his wife, also German, moved to western Pennsylvania, where Keil gained a reputation as a mystic and healer. By 1837, he had opened a drugstore in Pittsburgh, Pennsylvania. Keil soon heard about a group of former Harmony Society members who had left that communal group, and had moved to Phillipsburg (now Monaca, Pennsylvania), where they had tried to form the New Philadelphia Society. When Keil contacted the families in the early 1840s, he impressed some of them, and they suggested he form a communal society. As former members of such a society, they provided invaluable practical assistance to its founding and maintenance.