Sir Leslie Cannon CBE (21 February 1920 – 9 December 1970) was a prominent British trade union official and served as General President of the Electrical Trades Union from 1963 to 1970. He was born in Wigan, the son of a coal miner, and became a Communist activist, and trade union leader; member of Electrical Trades Union Executive Council, North Lancashire and Merseyside, 1948–1954. He left the Communist Party of Great Britain in 1956. In 1961 he uncovered an ETU ballot rigging scandal, and successfully sued the union. Cannon became president of the ETU in September 1963, a post left vacant by disgraced former president Frank Foulkes.

In his time as leader of the ETU, he took part in a merger with the plumbers' union to create the EETPU.

Cannon died from cancer, aged 50.

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Trade union offices
Preceded by General President of the Electrical Trades Union
1962–1968
Succeeded by
Position abolished
Preceded by
New position
General President of the Electrical, Electronic, Telecommunications and Plumbing Union
1968–1970
Succeeded by
Preceded by
New position
Electrical Group representative on the General Council of the TUC
1965–1970
Succeeded by