The Great Awakening was a religious revival in American religious history. Historians and theologians identify three or four waves of Great Awakening occurring from the early 18th century to the late 20th century, each characterized by widespread revivals led by evangelical Protestant ministers, a sharp increase of interest in religion, a profound sense of conviction and redemption on the part of those affected, a jump in evangelical church membership, and the formation of new religious movements and denominations.

The term Great Awakening can refer to several periods of religious revival in American religious history. Historians and theologians identify three or four waves of increased religious enthusiasm occurring between the early 18th century and the late 19th century. Each of these "Great Awakenings" was characterized by widespread revivals led by evangelical Protestant ministers, a sharp increase of interest in religion, a profound sense of conviction and redemption on the part of those affected, an increase in evangelical church membership, and the formation of new religious movements and denominations.

The Awakenings all resulted from powerful preaching that gave listeners a sense of personal guilt and of their need of salvation by Christ. Pulling away from ritual and ceremony, the Great Awakening made religion intensely personal to the average person by fostering a deep sense of spiritual guilt and redemption, and by encouraging introspection and a commitment to a new standard of personal morality. It brought Christianity to African-American slaves and was an apocalyptic event in New England that challenged established authority. It incited rancor and division between old traditionalists who insisted on the continuing importance of ritual and doctrine, and the new revivalists, who encouraged emotional involvement and personal commitment. It had a major impact in reshaping the Congregational church, the Presbyterian church, the Dutch Reformed Church, and the German Reformed denomination, and strengthened the small Baptist and Methodist denominations. It had little impact on Anglicans, and Quakers. Unlike the Second Great Awakening, which began about 1800 and reached out to the unchurched, the First Great Awakening focused on people who were already church members. It changed their rituals, their piety, and their self-awareness.