Scottish Protestant missions are organised programmes of outreach and conversion undertaken by Protestant denominations within Scotland, or by Scottish people. Long after the triumph of the Church of Scotland in the Lowlands, Highlanders and Islanders clung to a form of Christianity infused with animistic folk beliefs and practices. From 1708 the Society in Scotland for Propagating Christian Knowledge (SSPCK) began working in the area. In 1797 James Haldane founded the non-denominational Society for the Propagation of the Gospel at Home. Dozens of lay preachers, divinity students and English preachers were sent to the region. In the early nineteenth century a variety of organisations were formed to support evangelism to the region.
From the late eighteenth century the Industrial Revolution led to a rapid urbanisation of Scottish society. This created alarm amongst the Christians of the new Middle Class. The first urban mission was founded in Glasgow in 1826 and drew on all the Protestant churches. Thomas Chalmers advocated the "aggressive method", emphasising self-reliance backed up by intensive Sunday school and evangelistic efforts. By the 1870s every middle class urban congregation had its evangelisation association and usually a mission station. An inter-denominational Home Mission Union in Glasgow was formed in 1885 which ensured that rivalries did not develop. The "Layman's Revival" reached Scotland in 1859 and lasted until 1862. The visit of American Evangelists Moody and Sankey in 1874–75 revitalised the Evangelical mission.
The Scottish churches were relatively late to take up the challenge of foreign missions, but they came to embrace them enthusiastically. They were among the leading forces in European and American activity in India, sub-Saharan Africa, the West Indies, China and the New Hebrides, and missionary work became one of their major contributions to the business of Empire. Scottish foreign missionary work was mainly undertaken by small, local organisations that were often inter-denominational. The most famous Scottish missionary, David Livingstone, became an icon of evangelic outreach, self-improvement, exploration and a form of colonialism. Women also played a major role with single women like Mary Slessor becoming missionaries in their own right.
The Evangelical effort began to decline in intensity in the final decades of the nineteenth century. Urban religion became dominated by the working classes themselves, with new proletarian organisations. In the early twentieth century the focus of the churches broadened to include social problems. The 1910 World Missionary Conference held in Edinburgh, has been seen as the culmination of nineteenth-century Protestant Christian missions. The missionary drive began to decline after the First World War, although the Church of Scotland continued to attach importance to its efforts. Most of the imperial aspects of the foreign missionary project had gone by the 1950s and humanitarian efforts began to be more significant. Despite declining church attendances Evangelical missions continued in Scotland into the twentieth century. There were a series of initiatives connected with the re-united Church of Scotland between 1947 and 1956. The Tell Scotland Movement resulted in the controversial 1955 Billy Graham All-Scotland Crusade, which arrested the decline in church attendance. However, attendance declined rapidly from the 1960s, resulting in a reduction in home mission activity. Most evangelism was now left to local congregations and it was much smaller in scale. By the twenty-first century the increasingly secularised Scotland became the subject of a number of "reverse mission" from countries that Europeans and North Americans had originally evangelised.