The Atlantic Revolutions were numerous revolutions in the Atlantic World in the late 18th and early 19th century. Following the Age of Enlightenment, ideas critical of absolutist monarchies began to spread. A revolutionary wave soon occurred, with the aim of ending monarchical rule, emphasizing the ideals of the Enlightenment, and spreading liberalism.

A revolutionary wave or revolutionary decade is one series of revolutions occurring in various locations within a similar time-span. In many cases, past revolutions and revolutionary waves have inspired current ones, or an initial revolution has inspired other concurrent "affiliate revolutions" with similar aims. The causes of revolutionary waves have become the subjects of study by historians and political philosophers, including Robert Roswell Palmer, Crane Brinton, Hannah Arendt, Eric Hoffer, and Jacques Godechot.