Sir Keith Macpherson Smith, KBE (20 December 1890 – 19 December 1955) was an Australian aviator, who, along with his brother, Sir Ross Macpherson Smith, Sergeant James Mallett (Jim) Bennett and Sergeant Walter (Wally) Shiers, became the first people to fly from England to Australia.
On 12 November 1919, the brothers, along with Sergeant Jim Bennett and Sergeant Wally Shiers, departed from Hounslow Heath Aerodrome, England, in a Vickers Vimy aeroplane, eventually landing in Darwin, Australia on 10 December, having taken less than 28 days with an actual flying time of 135 hours.
The four men shared the £10,000 prize money put forward by the Australian government.
Keith and Ross were immediately knighted, while Shiers and Bennett were commissioned and each awarded a Bar to their Air Force Medals.The aircraft is preserved in a museum at the Adelaide Airport in South Australia.