(John) Joseph Knight (1829–1907) was an English dramatic critic and theatre historian.
Born at Leeds on 24 May 1829, he was elder son of Joseph Knight, a cloth merchant from Carlisle, and Marianne, daughter of Joseph Wheelwright. He was educated at Bramham College near Tadcaster.
Joining his father in business at age 19, Knight began collecting books. With Alfred Austin, his junior by six years, he helped to found a Mechanics' Institute at Leeds, at which he lectured on literary subjects. On 7 April 1854 he lectured on The Fairies of English Poetry to the Leeds Philosophical and Literary Society. At Leeds, too, he made the acquaintance of William Edward Forster, who stayed at Knight's house while he was parliamentary candidate for the constituency in 1859. Knight seconded Forster's nomination.
In 1860 Knight moved to London as a journalist. He found early employment as dramatic critic for the Literary Gazette, through a chance meeting with the editor John Morley. He then concentrated on writing about the contemporary stage. In 1869 he succeeded John Abraham Heraud, as dramatic critic of the The Athenæum, and retained the post for the rest of his life.
In 1871, during the siege of Paris, Knight used his influence to secure the invitation to the Comedie Française to act at the Gaiety Theatre in London. He also acted as dramatic critic for the Sunday Times, The Globe, and for the Daily Graphic from 1894 to 1906.