The English Civil War refers to a series of civil wars and political machinations between Royalists and Parliamentarians in the Kingdom of England from 1642 to 1651. Part of the wider 1639 to 1653 Wars of the Three Kingdoms, the struggle consisted of the First English Civil War and the Second English Civil War. The Anglo-Scottish War of 1650 to 1652 is sometimes referred to as the Third English Civil War.

While the conflicts in the three kingdoms of England, Scotland and Ireland had similarities, each had their own specific issues and objectives. The First English Civil War was fought primarily over the correct balance of power between Parliament and Charles I. It ended in June 1646 with Royalist defeat and the king in custody.

However, victory exposed Parliamentarian divisions over the nature of the political settlement. The vast majority went to war in 1642 to assert Parliament's right to participate in government, not abolish the monarchy, which meant Charles' refusal to make concessions led to a stalemate. Concern over the political influence of radicals within the New Model Army like Oliver Cromwell led to an alliance between moderate Parliamentarians and Royalists, supported by the Covenanters. Royalist defeat in the 1648 Second English Civil War resulted in the execution of Charles I in January 1649, and establishment of the Commonwealth of England.

In 1650, Charles II was crowned king of Scotland, in return for agreeing to create a Presbyterian church in both England and Scotland. The subsequent Anglo-Scottish War ended with Parliamentarian victory at Worcester on 3 September 1651.