Henry Thomas William Sara (14 August 1886, Islington - 1953) was an English industrial unionist active as an anarchist, communist and trotskyist.
Sara was born into a working class family, his father John Sara was a draper's assistant. Henry's first jobs included being a glass blower, a process block maker and a brewery engineer. He was an omnivorous reader and had a particular interest in Darwinism and the novels of Eugene Sue. Although a secularist he developed an interest in telepathy, spiritualism and theosophy.
Henry Sara developed lantern slide shows on such themes as "Russia Today", "war and struggle in Germany", "The Paris Commune", "Epochs of Social Change", "The French Revolution", "Ireland", "The Life and Work of Lenin" and "The Fraud of Spiritualism". More than 1,500 lantern slides which he used in these lectures are archived at the Modern Records Centre based at the University of Warwick.