Henry Solly (17 November 1813 – 27 February 1903) was an English social reformer.William Beveridge said of him: "He was a restless, inventive, constructive spirit, part author of at least three large living movements; charity organisation, working men's clubs, and garden cities".
He was the son of Isaac Solly and became a Chartist. He supported many Radical causes, such as universal suffrage, free education, repeal of the Corn Laws, co-operatives, anti-slavery, and early closing for shops and Sunday opening for museums. In the early 1860s he took a leading part in founding working men's clubs, though as a teetotaller he did not want them to sell alcohol.
In June 1868 Solly's paper, titled ‘How to deal with the Unemployed Poor of London and with its “Roughs” and Criminal Classes’ was read at a meeting of the Society of Arts, chaired by the Bishop of London, A. C. Tait. This led to plans for the Charity Organization Society.
In 1884 Solly founded the Society for the Promotion of Industrial Villages. Although this was a failure, it led to Sir Ebenezer Howard's Garden City movement.
Solly died of a brain haemorrhage in 1903. B. T. Hall, the secretary of the Working Men's Club and Institute Union, wrote a year later: "If the work that the Clubs do, if their influence on personal character and their contribution to the sum total of human happiness be correctly appreciated...then shall the investigator reckon Henry Solly amongst the constructive statesmen of our time".