Corrado John Soprano, Jr., played by Dominic Chianese, is a fictional character on the HBO TV series The Sopranos. Usually referred to as "Uncle Junior" or "Uncle June'", he is the mentor and surrogate father for mob boss Tony Soprano. A younger Corrado sometimes appears in flashbacks and is played by Rocco Sisto. Junior is regarded as arrogant, selfish, impulsive, and incompetent as a boss. In Mafia jargon, he "ate alone." Junior was very envious of others who held an advantage or position of superiority over him (especially towards his own family). He harbored resentment towards his younger brother John Francis "Johnny Boy" Soprano when he became "made" before him, as well as his own nephew Tony Soprano for his fast ascendancy as a star of the family that he had spent his whole life working in. Although Junior never directly murders anyone himself on the show, in Season One, he orders the murders of six people, including Christopher Moltisanti's former best friend and partner-in-crime Brendan Filone and the unsuccessful hit on Tony after he felt like Tony was conspiring against him. He also ordered a mock execution on Christopher in response to his and Brendan Filone's second hijacking of his trucks, even though they returned the truck's contents (expensive, Italian suits). Mikey Palmice, who was also his chauffeur and later Consigliere after Junior ascended to boss, performed all of Junior's hits. In the Season Six premiere "Members Only", during an episode of dementia, Junior thinks Tony is his old enemy Pussy Malanga, who had at the time been dead for six years and shoots him once in the abdomen. Junior vaguely recalls the shooting, and it is apparent it was not Tony he thought he was shooting but Malanga. His excuses range from he was confused to he was confused to maybe he wasn't acting alone (in reference to the JFK assassination).

Junior is Tony Soprano's uncle: Junior's younger brother was John Francis "Johnny Boy" Soprano, Tony's father. Both Junior and Johnny Boy dropped out of high school to join the DiMeo crime family. Junior and Johnny Boy were responsible for acquiring longtime Soprano asset, Satriale's Meat Market, from the eponymous Mr. Satriale. Satriale had a gambling problem and eventually committed suicide, leaving the place in the Soprano brothers' hands because of his debts. Junior always watched after Tony but after Johnny Boy's death from emphysema, Junior became Tony's surrogate father. Junior acted as Tony's leader and mentor, helping him rise through the ranks.

Following the arrest of DiMeo family boss Eckley DiMeo in late 1995, Junior got into a trucking dispute with new acting boss Jackie Aprile, Sr. He fled to Boca Raton to avoid any repercussions but his nephew, Tony arranged a sit down through Soprano soldier Sal "Big Pussy" Bonpensiero to solve the problem.