The Counter-Enlightenment refers to a loose collection of intellectual stances that arose during the European Enlightenment in opposition to its mainstream attitudes and ideals. The Counter-Enlightenment is generally seen to have continued from the 18th century into the early 19th century, especially with the rise of Romanticism. Its thinkers did not necessarily agree to a set of counter-doctrines but instead each challenged specific elements of Enlightenment thinking, such as the belief in progress, the rationality of all humans, liberal democracy, and the increasing secularisation of society.

The Age of Enlightenment was the intellectual and philosophical movement that occurred in Europe in the 17th and the 18th centuries. The Enlightenment featured a range of social ideas centered on the value of knowledge learned by way of rationalism and of empiricism and political ideals such as natural law, liberty, and progress, toleration and fraternity, constitutional government and the formal separation of church and state.