Republicanism in the United Kingdom

British republicans seek to replace the United Kingdom's monarchy with a republic led by an elected head of state. Monarchy has been the form of government used in the United Kingdom and its predecessor domains almost exclusively since the Middle Ages, with the exception of the Interregnum from 1649 to 1660, during which a nominally republican government did exist under the rule of Oliver and later Richard Cromwell.

After Cromwell's Protectorate fell and the monarchy was restored, governing duties were increasingly handed to Parliament, especially as a result of the Glorious Revolution of 1688. The adoption of the constitutional monarchy system made the argument for full republicanism less urgent. It was once again a topic of discussion during the late 18th century with the American Revolution, and grew more important with the French Revolution, when the concern was how to deal with the French Republic on their doorstep. This led to a widespread anti-republican movement in Britain, and the issue was dormant for a time.

Dissatisfaction with British rule led to a longer period of agitation in the early 19th century, with failed republican revolutions in Canada in the late 1830s and Ireland in 1848. This led to the Treason Felony Act in 1848, which made it illegal to advocate for republicanism. Another "significant incarnation" of republicanism broke out in the late 19th century, when Queen Victoria went into mourning and largely disappeared from public view after the death of her husband, Prince Albert. This led to questions about whether or not the institution should continue, with politicians speaking in support of abolition.