This thesis is a case study in a Social Gospel approach to nature, human health and environmental politics. Human health and non-human nature were mutually constitutive in Washington Gladden's vision of health. In sermons from 1869 to 1910, Gladden argued that human health was closely connected to the health of societies and cities, for the simple fact that humanity was a part of nature. The local, urban aspects of Gladden's Social Gospel vision of health were an important connective tissue to understand his broader moral and economic arguments. Gladden's distinct notions of social morality and social harmony are best understood at the intersection of religious histories of the Social Gospel, urban environmental histories and public health histories. Gladden emphasized social morality through scientific public health and the conservation movement. His vision of social health was an ideal of social harmony supported by professionals who understood that human beings were capable of ordering God's creation so that humanity could live healthy lives in healthy places around the world.