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- J. Chester and Elizabeth Fletcher Allen · two lawyers, thirty years of cases Black History
- Jackie Walorski — five terms in Congress Famous People
- Jaden Ivey: The Fifth Pick Sports Players
- James Helms Kasler: three Air Force Crosses War Heroes
- James Mueller: the chief of staff succeeds Government
- James Oliver and Harvey Little — the foundry quarter-shares Founders & CEOs
- James Oliver and the chilled plow: the patent of 30 June 1857 Inventors & Inventions
- January 1957: the year's first index page UFO Sightings
- Javon Small: The Register's Newest Basketball Name Sports Players
- Jean Charlot at Saint Mary's: the Saints of the Arts Artists
- Jean Faut: The Best Pitcher in the League South Bend Blue Sox
- Jean Faut: The League's Greatest Pitcher, Eight Years a Blue Sox Sports Players
- The Jefferson Hotel Hotels
- Jeremy Leven: the novelist-screenwriter of The Notebook, born here Notable People
- Jerry Scott — the comics, written from a Tribune paper route Authors & Books
- Jerry Scott: the comics page Comedy
- The Jersey Line: the New Jersey, Indiana & Illinois Railroads
- The Jewish community: William Street and after Communities
- Jim Crow without signs · public accommodations and the Kale test case Black History
- Jimmy Brogan: formed on South Quad Comedy
- Joan Kroc, twice: a 50 million dollar bequest to Notre Dame, and the Kroc Center on the west side Major Donations
- Joe E. Kernan: the comptroller who became governor Government
- Joe Kernan: the catcher, the prisoner, the governor Notable People
- Joe Kuharich: Riley's Guard, Notre Dame's Coach Sports Players
- Joe's Tavern: the west side's 120-year room Bars & Nightclubs
- John Bellairs — the Gothic children's novelist Notre Dame formed Authors & Books
- John Clarkson Birdsell and the huller fight that reached the Supreme Court Inventors & Inventions
- John Comly Birdsell — the Quaker farmer who mechanized the clover field Founders & CEOs
- John D. DeFrees: the printer who started the city's press — and Colfax Notable People
- John J. and Miles W. O'Brien — the lathe twins Founders & CEOs
- John Laskowski: The Super Sub Sports Players
- John Voorde: forty years an elected official Public Servants
- John Wooden, the Player: The Streak That Still Stands Sports Players
- Johnny Nate's Fighters: Emerick, Hagen and Kugler Sports Players
- Jordan: the Nash salesman on Jefferson Boulevard Dealerships
- Joseph D. Barry: the pastor who went as a chaplain War Heroes
- Joseph D. Oliver — the heir who ran it Founders & CEOs
- Joseph K. Sosnowski: the west side's photographer Photographers
- Jr. Walker: the sound the west side sent to Motown Notable People
- Judd Leighton: A Fortune Documented Through Its Foundation Great Fortunes
- Judge Grant and the federal bench Public Servants
- July 1967 and April 1968 · the shooting of Melvin Phillips, and four thousand marchers Black History
- July 1967 and April 1968 · the shooting, the curfew, and the march Wars, Unrest & Disasters
- July 20, 1952: South Bend's one NASCAR race Racing
- Junior Walker — the Motown saxophonist who grew up here Famous People
- Junior Walker: formed in South Bend Music