John Connolly may refer to:
- John Connolly (author) (born 1968), Irish author whose best-known novels revolve around former policeman Charlie Parker
- John Connolly (bishop) (1750–1825), Irish-born second bishop of New York
- John Connolly (blogger), Irish blogger and activist responsible for critically damaging the presidential campaign of Irish Senator David Norris
- John Connolly (FBI) (born 1940), American imprisoned former FBI agent
- John Connolly (hurler) (born 1948), retired Irish hurler
- John Connolly (Irish footballer) (born 1971), Irish footballer
- John Connolly (loyalist) (1741–1813), American doctor from Pennsylvania, agent of John Murray, 4th Earl of Dunmore, active during the American Revolution
- John Connolly (musician) (born 1968), American musician with Sevendust
- John Connolly (rugby union coach) (born 1951), Australian former head coach of the Australia national rugby union team
- John Connolly (Scottish footballer) (born 1950), Scottish football player and manager
- John Joseph Connolly (1906–1982), Canadian parliamentarian and law professor
- John L. Connolly (1871–1933), Canadian merchant and political figure in Nova Scotia, Canada
- John Patrick Connolly (1894–1971), American politician convicted of bribery
- John P. Connolly (businessman) (born 1950), British Chairman of Deloitte
- John R. Connolly (born 1973), American city councillor at-large of Boston, Massachusetts
- John W. Connolly (1911–1981), 46th Lieutenant Governor of Michigan