Samuel Liddell (or Liddel) MacGregor Mathers (8 or 11 January 1854 – 5 or 20 November 1918), born Samuel Liddell Mathers, was a British occultist. He is primarily known as one of the founders of the Hermetic Order of the Golden Dawn, a ceremonial magic order of which offshoots still exist today.
Mathers was born on 8 or 11 January 1854 in Hackney, London, England. His father, William M. Mathers, died while he was still a boy. His mother, whose maiden name was Collins, died in 1885. He attended Bedford School, subsequently working in Bournemouth, Dorset, as a clerk, before moving to London following the death of his mother.