Sidney James Webb, 1st Baron Passfield PC OM (13 July 1859 – 13 October 1947) was a British socialist, economist, reformer and a co-founder of the London School of Economics. He was one of the early members of the Fabian Society in 1884, along with George Bernard Shaw (they joined three months after its inception). Along with his wife, Beatrice Webb, Annie Besant, Graham Wallas, Edward R. Pease, Hubert Bland, and Sydney Olivier, Shaw and Webb turned the Fabian Society into the pre-eminent political-intellectual society of England in the Edwardian era and beyond. He wrote the original Clause IV for the British Labour Party.
Martha Beatrice Webb, Baroness Passfield (née Potter; 22 January 1858 – 30 April 1943), was an English sociologist, economist, socialist, labor historian and social reformer. Her husband Sidney became Baron Passfield in 1929. Along with her husband and numerous others, Webb co-founded the London School of Economics and Political Science and played a crucial role in forming the Fabian Society. She coined the term "collective bargaining".