John Horgan (1959–2024) was a Canadian politician and premier of British Columbia.

John Horgan may also refer to:

Politicians John Horgan (Australian politician) (1834–1907), Australian politician, Western Australia MLC John Horgan (Irish politician) (1876–1955), Irish politician John Horgan (Irish nationalist) (1881–1967), Irish Cork-born nationalist politician, solicitor and author

Sportspeople John Horgan (hurler) (1950–2016), Irish sportsperson John G. Horgan (1866–1921), pocket billiards (pool) player

Others John Horgan (academic) (born 1940), Irish press ombudsman, former journalist, politician and professor John Horgan (journalist) (born 1953), American science journalist John Horgan (psychologist) (born 1974), Irish political psychologist, terrorism researcher, and professor John Horgan, chairman of the Western Australian Development Corporation