Portrait of William Ewart Gladstone in the context of "Gladstonian liberalism"

Gladstonian liberalism or Gladstonianism is a political doctrine named after the British Victorian Prime Minister and Liberal Party leader William Ewart Gladstone. Gladstonian liberalism consisted of limited government expenditure and low taxation whilst making sure government had balanced budgets and the classical liberal stress on self-help and freedom of choice. Gladstonian liberalism also emphasised free trade, opposed government intervention in the economy and supported freedom and liberty as moral ideals. It is referred to as laissez-faire or classical liberalism in the United Kingdom and is often compared to Thatcherism.

Gladstonian financial rectitude had a partial lasting impact on British politics and the historian John Vincent contends that under Lord Salisbury's premiership he "left Britain's low tax, low cost, low growth economy, with its Gladstonian finance and its free trade dogmas, and no conscript army, exactly as he had found it...Salisbury reigned, but Gladstone ruled". In the early 20th century the Liberal Party began to move away from Gladstonian liberalism and instead developed new policies based on social liberalism (or what Gladstone called "constructionism"). The Liberal government of 1905–1914 is noted for its social reforms and these included old age pensions and National Insurance. Taxation and public expenditure was also increased and New Liberal ideas led to David Lloyd George's People's Budget of 1909–1910.