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.

His mother was born in Western Australia, daughter of a Scottish pioneer.

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.

Keith and Ross Smith were immediately knighted, while Shiers and Bennett were commissioned and each awarded a Bar to their Air Force Medals.

[1] Smith unsuccessfully stood for preselection as the Nationalist Party candidate at the 1931 East Sydney by-election.