The Belfast Protestant Association was a populist evangelical political movement in the early 20th-century. The Association was founded in the last years of the 19th century by Arthur Trew, a former shipyard worker, who had become an evangelical Protestant preacher and made fiercely anti-Catholic speeches on the steps of Belfast Customs House. Soon after the 1906 general election, the Association's treasurer, a Mr Galbraith, disappeared with all the funds, and the organisation collapsed.