Dr Archibald Keightley (1859–1930) was a prominent member of the Theosophical Society who helped in the editing of Helena P. Blavatsky's magnum opus, The Secret Doctrine. He served as the General Secretary of the English Theosophical Society from 1888 to 1890. He was married to Julia van der Planck a.k.a. "Jasper Niemand", the author of a number of Theosophical tracts. His nephew Bertram Keightley was also a Theosophist.
He later sided with William Quan Judge and his American branch over that led by Annie Besant, and then the faction associated with Ernest Temple Hargrove over that led by Katherine Tingley. After the death of his wife, he relocated to New York City, where he participated in the activities of the "Hargrove" branch until his death in 1930.