All Souls Unitarian Church is a Unitarian Universalist congregation in Tulsa, Oklahoma, founded in 1921 by publisher Richard Lloyd Jones and engineer W. R. Holway. As of April 2022 it reported more members than any other congregation in the Unitarian Universalist Association, making it the largest UUA congregation. The congregation has occupied its current building near the Maple Ridge district, designed by John Duncan Forsyth and completed in 1955, since 1957. Its long-serving ministers have included John Wolf (1960-1995) and Marlin Lavanhar, senior minister since 2000.