John Kelly
John or Jack Kelly may refer to:
People
Academics and scientists
- John Kelly (engineer), Irish professor, former Registrar of University College Dublin
 - John Kelly (scholar) (1750–1809), at Douglas, Isle of Man
 - John Forrest Kelly (1859–1922), scientist
 - John Larry Kelly Jr. (1923–1965), scientist at Bell Labs
 - John F. Kelly (professor), professor of addiction medicine
 - John Norman Davidson Kelly, British theologian and academic
 
Arts and entertainment
- Jack Kelly (actor) (1927–1992), American film and TV actor, in American TV series Maverick
 - John Kelly (actor) (1901–1947), American film actor whose credits include Meet Dr. Christian
 - John Kelly (artist) (born 1965), Australian artist
 - John Kelly (author) (born 1964), British author and illustrator
 - John Kelly (born 1978), member of the Doctor Who Restoration Team
 - John Kelly (Irish broadcaster) (born 1965), Irish radio broadcaster and presenter of The View
 - John Liddell Kelly (1850–1925), British journalist and poet
 - John Melville Kelly (1879–1962), American/Hawaiian artist
 - John Kelly (performance artist) (born 1959), American performance artist, visual artist and writer
 - Johnny Kelly (born 1968), American drummer
 
Politicians
United Kingdom
- John Kelly (Sinn Féin politician) (1936–2007), Northern Irish republican leader
 - John Richards Kelly (1844–1922), British Member of Parliament for Camberwell North, 1886–1892
 - Basil Kelly (John William Basil Kelly, 1920–2008), Northern Irish Unionist politician
 
United States
- Jack Kelly (politician) (born c. 1939), former Philadelphia Republican councilman-at-large
 - John Kelly (New York politician) (1822–1886), politician in Tammany Hall, U.S. Representative from New York (1855–1858)
 - John B. Kelly (Boston politician) (died 1969), Boston City councilor
 - John David Kelly (1934–1998), American judge
 - John F. Kelly (born 1950), former White House Chief of Staff, United States Marine Corps general, and Secretary of Homeland Security
 - John F. Kelly (Michigan politician) (1949–2018), Judge Advocate General and State Senator for Michigan
 - John R. Kelly (born 1946), Republican member of the West Virginia House of Delegates
 - John V. Kelly (1926–2009), American Republican Party politician in New Jersey
 - John Kelly (Brooklyn politician) (1855–1900), American politician from New York
 
Other countries
- John Kelly (bailiff) (c. 1793–1854), Member of the House of Keys and High Bailiff of Castletown, Isle of Man
 - John Kelly (Canadian politician) (1852–1934), municipal councillor in Edmonton, Alberta, Canada
 - John Kelly (New South Wales politician) (1840–1896), Australian politician
 - John Kelly (Roscommon politician) (born 1960), Irish Labour Party Senator
 - John M. Kelly (politician) (1931–1991), Irish Fine Gael politician, cabinet member, legal scholar, and novelist
 - John Robert Kelly (1849–1919), farmer and politician in colonial South Australia
 
Military personnel
- John Kelly of Killanne (died 1798), leader of the Irish Rebellion of 1798 in Wexford
 - Jack Sherwood Kelly (1880–1931), adventurer and soldier awarded the Victoria Cross
 - John Kelly (Royal Navy officer) (1871–1936), British Admiral of the Fleet
 - John D. Kelly (Korean War soldier) (1928–1952), USMC, Korean War Medal of Honor recipient
 - John D. Kelly (World War II soldier) (1923–1944), American soldier, World War II Medal of Honor recipient
 - John F. Kelly (born 1950), White House Chief of Staff, United States Marine Corps general, and Secretary of Homeland Security
 - John H. Kelly (1840–1864), Confederate brigadier general
 - John J. Kelly (1898–1957), USMC, World War I, Army Medal of Honor and Navy Medal of Honor recipient
 
Sportspeople
Association football
- Jack Kelly (English footballer) (1913–2000), English footballer with clubs including Burnley and Leeds United
 - John Kelly (footballer, born 1909) (1909–?), English footballer for York City
 - John Kelly (footballer, born 1913) (1913–?), English footballer for Bradford City
 - John Kelly (footballer, born 1921) (1921–2001), Scottish international football player (Barnsley)
 - John Kelly (footballer, born 1935), Scottish footballer for Crewe Alexandra
 - John Kelly (footballer, born 1960), Anglo-Irish soccer player whose clubs included Tranmere Rovers, Preston
 - John Paul Kelly (football) (born 1987), Irish footballer
 
American football
- John Kelly (offensive lineman) (1944–2015), American football player
 - John Kelly (running back) (born 1996), American football running back
 - Shipwreck Kelly (American football) (John Simms Kelly, 1910–1986), American football player
 - Jack Kelly (American football) (born 2003), American football player
 
Rugby football
- John Kelly (rugby, born 1917), English former rugby union and professional rugby league footballer
 - John Kelly (rugby union, born 1974), Irish rugby union player
 - Jack Kelly (rugby union, born 1926) (1926–2002), New Zealand rugby union player
 - Jack Kelly (rugby union, born 1997), Irish rugby union player
 
Other sports
- Kick Kelly (John O. Kelly, 1856–1926), American baseball player and umpire, boxing referee and gambling operator
 - Jack Kelly (Australian footballer) (1916–1971), Australian rules footballer for St Kilda
 - John Kelly (boxer) (1932–2016), Northern Irish boxer
 - John Kelly (catcher) (1859–1908), 1879–1884 baseball player
 - John Kelly (equestrian) (born 1930), Australian Olympic equestrian
 - John Kelly (golfer) (born 1984), American amateur golfer
 - John Kelly (Lancashire and Derbyshire cricketer) (1922–1979), English cricketer
 - John Kelly (Nottinghamshire cricketer) (1930–2008), English cricketer
 - John Kelly (outfielder) (1879–1944), 1907 baseball player
 - John Kelly (racewalker) (1929–2012), Irish Olympic athlete
 - John Kelly (triple jumper) (born c. 1938), American triple and long jumper, 1959 NCAA runner-up for the Stanford Cardinal track and field team
 - John Kelly (sportscaster) (born 1960), ice hockey sportscaster
 - John Kelly (Tipperary hurler) (born 1948), Irish retired sportsperson
 - Jack Kelly Jr. (rower) (1927–1985), John B. Kelly Jr., an Olympic rower, Philadelphia councilman, head of the US Olympic Committee and brother of Grace Kelly
 - Jack Kelly Sr. (rower) (1889–1960), John B. Kelly Sr. (nicknamed "Jack"), Olympic rower, father of actress, Grace Kelly and John B. Kelly Jr.
 - Jack Kelly (hurler) (born 1996), Irish hurler
 - John Kelly (runner) (born 1984), American endurance athlete
 - John-Paul Kelly (ice hockey) (born 1959), Canadian ice hockey player
 
Other people
- John Kelly (1840–1904), British architect specialising in churches, see Kelly & Birchall
 - John Kelly (coal merchant) (1840-1904), Irish businessperson, philanthropist, shipowner and coal merchant
 - John Kelly (diplomat) (born 1941), British diplomat and governor of the Turks and Caicos Islands
 - John Kelly (minister) (1801–1876), Congregational minister
 - John A. Kelly (1943–1978), American investigative journalist in Boston, Massachusetts
 - John E. Kelly III, American executive at IBM
 - Gregory Kelly (bishop) (John Gregory Kelly, born 1956), American Roman Catholic bishop
 - John Hall Kelly (1879–1941), former Canadian High Commissioner to Ireland
 - John Hubert Kelly (1939–2011), U.S. diplomat
 - John P. Kelly (clergyman), convening apostle of the International Coalition of Apostolic Leaders
 - Jack Kelly, founder of British news organization TLDR News
 
Characters
- John Clark (Ryanverse character), born John Terence Kelly, character in a number of Tom Clancy novels
 - Jack Kelly, character in the 1992 Disney film Newsies
 - Jack Kelly, lawyer uncle in It's Always Sunny in Philadelphia
 - John Kelly, character on the TV series NYPD Blue, played by David Caruso
 - John Kelly, character on the TV series Brooklyn Nine-Nine, played by Phil Reeves
 
Other
- John Kelly Girls' Technology College
 - John Kelly Limited, shipowner, coal and oil merchant
 - John P. Kelly (album), a 2001 album by rapper Mr. Cheeks