John Ellis (October 4, 1874 – September 20, 1932) was a British executioner from 1901 to 1924.

John Ellis is a British theoretical physicist born in 1946. He attended Cambridge University, and led the particle theory group at CERN for six years. He is best known for assisting Dimitri Nanopoulos in the unification of string theory with the Standard Model.

John Ellis (1789-1862) of Beaumont Leys in Leicestershire was instrumental in interesting George Stephenson in the proposed Leicester and Swannington Railway.

John Ellis is a British guitarist and songwriter born in London in 1952. He was a founding member of punk rock group The Vibrators. Ellis formed The Vibrators in 1974 while still at art school studying illustration.

John Ellis (born 1952) was an Irish Fianna Fáil party politician who has served for nearly thirty years in the Oireachtas, as a Senator and TD.

John Ellis (born 22 October 1930) is a British Labour Party politician.