John Delaney may refer to:
- John Delaney (politician) (born 1956), American lawyer, politician and university administrator
- John J. Delaney (1878–1948), United States Congressman from New York in the early 20th century
- John Delaney (businessman) (1969–2011), Irish businessman and the founder of the trading exchange website Intrade
- John Delaney (football administrator) (born 1967), chief executive of the Football Association of Ireland
- John Delaney (meteorologist) (1811–1883), politician, postmaster general and early meteorologist in Newfoundland
- John A. Delaney (hurler) (born 1986), Irish hurler
- John K. Delaney (born 1963), businessman and candidate for the U.S. House of Representatives