In the United Kingdom, the Edwardian era was a period in the early 20th century that spanned the reign of King Edward VII from 1901 to 1910. It is commonly extended to the start of the First World War in 1914, during the early reign of King George V.

The era is dated from the death of Queen Victoria in January 1901, which marked the end of the Victorian era. Her son and successor, Edward VII, was already the leader of a fashionable elite that set a style influenced by the art and fashions of continental Europe. Samuel Hynes described the Edwardian era as a "leisurely time when women wore picture hats and did not vote, when the rich were not ashamed to live conspicuously, and the sun never set on the British flag."

The Liberals returned to power in 1906 and made significant reforms. Below the upper class, the era was marked by significant shifts in politics among sections of society that had largely been excluded from power, such as labourers, servants, and the industrial working class. Women started (again) to play more of a role in politics.

The Edwardian period is sometimes portrayed as a romantic golden age of long summer days and garden parties, basking in a sun that never set on the British Empire. This perception was created in the 1920s and later by those who remembered the Edwardian age with nostalgia, looking back to their childhoods across the abyss of the Great War. The Edwardian age was also seen as a mediocre period of pleasure between the great achievements of the preceding Victorian age and the catastrophe of the following war.

Recent assessments emphasise the great differences between the wealthy and the poor during this period and describe the age as heralding great changes in political and social life. Historian Lawrence James argued that the leaders felt increasingly threatened by rival powers such as Germany, Russia, and the United States. Nevertheless, the sudden arrival of World War I in the summer of 1914 was largely unexpected, except by the Royal Navy, because it had been prepared and readied for war.

There was a growing political awareness among the working class, leading to a rise in trade unions, the Labour movement and demands for better working conditions. The aristocracy remained in control of top government offices.

The Conservatives – at the time called "Unionists" – were the dominant political party from the 1890s until 1906. The party had many strengths, appealing to voters supportive of imperialism, tariffs, the Church of England, a powerful Royal Navy, and traditional hierarchical society. There was a powerful leadership base in the landed aristocracy and landed gentry in rural England, plus strong support from the Church of England and military interests. Historians have used election returns to demonstrate that Conservatives did surprisingly well in working-class districts. They had an appeal as well to the better-off element of traditional working-class Britons in the larger cities.

In rural areas, the national headquarters made highly effective use of paid travelling lecturers, with pamphlets, posters, and especially lantern slides, who were able to communicate effectively with rural voters – particularly the newly enfranchised agricultural workers. In the first years of the twentieth century, the Conservative government, with Arthur Balfour as Prime Minister, had numerous successes in foreign policy, defence, and education, as well as solutions for the issues of alcohol licensing and land ownership for the tenant farmers of Ireland.