Leonard Huxley (11 December 1860 – 2 May 1933) was an English schoolteacher, writer and editor.
His father was the zoologist Thomas Henry Huxley, commonly referred to as 'Darwin's bulldog'. Leonard was educated at University College School, London, St. Andrews University, and Balliol College, Oxford. He first married Julia Arnold, daughter of Tom Arnold. She was a sister of the novelist Mrs. Humphry Ward, niece of the poet Matthew Arnold, and granddaughter of Thomas Arnold, the headmaster of Rugby School (immortalised as a character in Tom Brown's Schooldays).