Sir Leonard George Holden Huxley KBE (29 May 1902 – 4 September 1988) was an Australian physicist.
Huxley was born in London, the eldest son of George Hamborough and Lilian Huxley. He was a second-cousin once removed of Thomas Huxley. His family migrated from England to Australia in 1905 when he was three, and settled in Tasmania, where Huxley showed great academic and sporting promise. He won a Rhodes Scholarship to New College, Oxford while in his second year at the University of Tasmania and obtained a D.Phil from Oxford in 1928. He died in London at the age of 86.