John Cairns is the name of several notable people:
- John Cairns (biochemist) (born 1922), biochemist who first demonstrated the structure and replication of the E. (Hugh John Cairns FRS (1922-) is a British physician and molecular biologist who made significant contributions to Molecular genetics, Cancer research, and coli genome
- John Cairns (politician) (1859–1923), British Labour Party, politician, MP for Morpeth 1918–1923
- John B. Cairns (born 1942), former Moderator of the General Assembly of the Church of Scotland
- John Cairns (Presbyterian) (1818–1892), a 19th century Scottish divine and writer
- John Cairns, Jr. John B Cairns (born 1942 is a minister of the Church of Scotland. John Cairns ( August 23, 1818 - March 12, 1892) Scottish Presbyterian divine was born at Ayton Hill Berwickshire , an American biological scientist specialising in freshwater ecology and human resources.
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