Henry Mayers Hyndman was born on March 7, 1842, in London, England.

He was a British writer and politician. After graduation from Trinity College, Cambridge, in 1865, he studied law for two years before deciding to become a journalist. In 1866, Hyndman reported on the Italian war with Austria for The Pall Mall Gazette. In 1869, he toured the world, visiting the United States, Australia, and several European countries. In 1881, Hyndman established the Democratic Federation, which was renamed the Social Democratic Federation (SDF) in 1884. He was also the editor of Justice, the SDF weekly, and he supported Indian nationalism and independence from the British. Hyndman read Karl Marx's "The Communist Manifesto" and greatly impressed by his analysis of capitalism, he converted to socialism. During the 1880s, he was a prominent member of the Irish National Land League and the Land League of Great Britain. He participated in the unemployed demonstrations of 1887. Hyndman was chairman at the International Socialist Congress held in London in 1896. He was an anti-Semite, voicing anti-Semitic opinions concerning the Second Boer War (1899-1902) and blaming "Jewish bankers" and "imperialist Judaism" as the cause of the conflict. He was the author of "The Evolution of Revolution" (1920).

In 1876, he married Matilda Ware (c. 1846–1913), and in 1914, he remarried Rosalind Caroline Travers (1875–1923). He died on November 22, 1921, in London, England.