Arthur Douglas Wagner was a Church of England clergyman in Brighton, East Sussex, England. He served for more than 50 years at St Paul's Church in the town—first as a curate, then from 1873 as its vicar. As the only son of the Rev. Henry Michell Wagner and his wife Elizabeth Harriott, who died when he was a child, Arthur Wagner inherited considerable wealth. Following the pattern set by his father—who founded several churches in Brighton—he was able to pay for the construction and endowment of four churches in the town, three of which survive, and another in rural East Sussex where he owned a country estate. Like his father, he became embroiled in disputes and controversy: he held strongly Tractarian views and was often criticised for the advanced ritualism of the services he held at St Paul's, while his involvement in the Constance Kent affair caused national debate about priest–penitent privilege.

St Paul's Church, dedicated to the missionary and Apostle to the Gentiles Paul of Tarsus, is a Church of England parish church in Brighton, Sussex, England. It is located on West Street in the city centre, close to the seafront and the main shopping areas.