Sidney James Webb, 1st Baron Passfield, was a British socialist, economist and reformer, who co-founded the London School of Economics. He was an early member of the Fabian Society in 1884, joining, like George Bernard Shaw, three months after its inception. Along with his wife Beatrice Webb and with Annie Besant, Graham Wallas, Edward R. Pease, Hubert Bland and Sydney Olivier, Shaw and Webb turned the Fabian Society into the pre-eminent politico-intellectual society in Edwardian England. He wrote the original, pro-nationalisation Clause IV for the British Labour Party.

The London School of Economics and Political Science (LSE) is a public research university in London, England, and a member institution of the University of London. Founded in 1895 by Fabian Society members Sidney Webb, Beatrice Webb, Graham Wallas and George Bernard Shaw, LSE joined the University of London in 1900 and established its first degree courses under the auspices of the university in 1901. LSE began awarding its degrees in its own name in 2008, prior to which it awarded degrees of the University of London. It became a university in its own right within the University of London in 2022.