The English Interregnum was the period of parliamentary and military rule by the Lord Protector Oliver Cromwell under the Commonwealth of England after the English Civil War. It began with the overthrow, and execution, of Charles I in January 1649, and ended with the restoration of Charles II on May 29, 1660.

This era in English history can be divided into four periods.

After the Parliamentarian victory in the Civil War, the Puritan views of the majority of Parliament and its supporters began to be imposed on the rest of the country. The Puritans advocated an austere lifestyle and restricted what they saw as the excesses of the previous regime. Most prominently, holidays such as Christmas and Easter were suppressed. Pastimes such as the theatre and gambling were also banned. However, some forms of art that were thought to be 'virtuous', such as opera, were encouraged. These changes are often credited to Oliver Cromwell, though they were originally introduced by the Commonwealth Parliament; and Cromwell, when he came to power, was a liberalising influence.