Socialism in the United Kingdom is thought to stretch back to the 19th century from roots arising in the aftermath of the English Civil War. Notions of socialism in Great Britain have taken many different forms from the utopian philanthropism of Robert Owen through to the reformist electoral project enshrined in the birth of the Labour Party that was founded in 1900.

Liberal socialism is a political philosophy that incorporates liberal principles to socialism. This synthesis sees liberalism as the political theory that takes the inner freedom of the human spirit as a given and adopts liberty as the goal, means and rule of shared human life. Socialism is seen as the method to realize this recognition of liberty through political and economic autonomy and emancipation from the grip of pressing material necessity. Liberal socialism opposes abolishing certain components of capitalism and supports something approximating a mixed economy that includes both social ownership and private property in capital goods.