Archibald Keightley (19 April 1859 – 18 November 1930) was an English physician and Theosophist.

He was a Fellow of the Royal College of Surgeons and Master of Arts and Doctor of Medicine from Cambridge.

[3] Keightley was a prominent member of the TS who helped in the editing of Helena P. Blavatsky's magnum opus, The Secret Doctrine.

[5] Bertram Keightley, his uncle (although younger by one year), 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.