X俱乐部（英语：X Club），于19世纪末，在英国伦敦出现的私人团体，以汤玛斯·亨利·赫胥黎为首，成员有九个，于1864年11月3日首次聚会，1893年后解散。他们以推动自然选择与演化论的研究为宗旨，在英国科学研究界很有影响力。最早的科学期刊，自然期刊，即是由这个俱乐部的成员所创。

The X Club was a dining club of nine men who supported the theories of natural selection and academic liberalism in late 19th-century England. Thomas Henry Huxley was the initiator: he called the first meeting for 3 November 1864. The club met in London once a month—except in July, August and September—from November 1864 until March 1893, and its members are believed to have wielded much influence over scientific thought. The members of the club were George Busk, Edward Frankland, Thomas Archer Hirst, Joseph Dalton Hooker, Thomas Henry Huxley, John Lubbock, Herbert Spencer, William Spottiswoode, and John Tyndall, united by a "devotion to science, pure and free, untrammelled by religious dogmas."