Graham Wallas (May 31, 1858 - August 9, 1932) was an English socialist, social psychologist, educationalist, and a leader of the Fabian Society.
Born in Monkwearmouth, Sunderland, Wallas was educated at Shrewsbury School and Corpus Christi College, Oxford. It was at Oxford that Wallas abandoned religion and converted to rationalism. He taught at Highgate School until 1885, when he resigned rather than participate in communion, and was President of the Rationalist Press Association.
Wallas joined the Fabian Society in April 1886, following his acquaintances Sidney Webb and George Bernard Shaw. He was to resign in 1904 in protest at Fabian support for Joseph Chamberlain's tariff policy.
He lectured at the newly-founded London School of Economics from 1895.