John Cairns may refer to:
- John Cairns (biochemist) (born 1922), biochemist who first demonstrated the structure and replication of the E. coli genome
- John Cairns (politician) (1859–1923), British Labour Party, politician, MP for Morpeth, 1918–1923
- John Cairns (born 1942), former Moderator of the General Assembly of the Church of Scotland
- John Cairns (1818–1892), Scottish divine and writer
- John Cairns (1857–1922), United Presbyterian Church minister, writer and biographer
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