Risky Business is a 1983 American coming-of-age teen comedy film written and directed by Paul Brickman (in his directorial debut) and starring Tom Cruise and Rebecca De Mornay. It follows the sexual exploits of high school senior Joel Goodsen (Cruise), who is staying home alone during his parents' vacation trip and meets a call girl named Lana (De Mornay). The film is considered to be Cruise's breakout role.

Risky Business was released theatrically in the United States on August 5, 1983. A commercial and critical success, the film grossed more than $63 million at the box office, making it the tenth-highest-grossing film of 1983 in the United States, and received acclaim, with many comparing it to The Graduate (1967). Cruise's performance earned him the first Golden Globe Award nomination of his career.

Retrospective critical analysis has recognized Risky Business as one of the best high school and teen films of all time.

High-achieving high school student Joel Goodsen lives with his wealthy parents in the Chicago North Shore area of Glencoe. His father wants him to attend Princeton University, his alma mater, so Joel participates in Future Enterprisers, an extracurricular activity in which students work in teams to create small businesses.

When Joel's parents go away on a trip, his friend Miles convinces him to use his newfound freedom to have some fun. On the first night, Joel raids the liquor cabinet, plays the stereo loudly, joyrides in his father's car and dances around the living room in his briefs and button-down shirt to "Old Time Rock and Roll".

The following day, Miles calls a prostitute named Jackie on Joel's behalf. Jackie turns out to be a male cross-dresser, so Joel pays him just to leave. But, as he is leaving, he gives Joel the number for another prostitute, Lana. That night, Joel is unable to sleep and hesitantly calls Lana, who is revealed as a gorgeous blonde woman, and they spend the entire night having sex.

The next morning, Lana asks Joel for $300 for her services. He goes to the bank, but when he returns, she is gone, along with his mother's expensive Steuben glass egg. Joel finds Lana and demands the egg back, but her pimp Guido interrupts them, pulling a gun. While in his father's Porsche 928, Joel is chased by Guido, but eventually escapes.

Lana tells Joel that the egg is with the rest of her belongings at Guido's. He lets her stay at his house while he goes to school. When he returns, his friends have come over, and Lana has invited another prostitute, Vicki, to stay, but Joel rejects the idea. The women leave, only to encounter Guido and get into an altercation on Joel's front lawn before running back into his house. Joel agrees to the women spending one more night.

Later that night, Joel, Lana, Vicki, and Joel's friend Barry go out and get high on marijuana. After Lana accidentally bumps the Porsche out of gear while retrieving her purse, the car rolls down the hill and onto a pier (despite Joel's desperate attempt to stop it); the pier collapses, and the Porsche sinks into Lake Michigan.

When Joel takes the car to a repair shop, he is horrified to learn how much fixing it will cost. He and Lana later decide to turn his parents' house into a brothel for a night; Joel's share of the profits will pay for the repairs. The party is hugely successful; the house is packed with Joel's friends and classmates and Lana's co-workers.

However, the recruiter from Princeton, Rutherford, chooses that night to interview Joel for admission to Princeton. The interview is plagued by interruptions, and Rutherford is unimpressed by Joel's résumé. Afterwards, he stays at the party and becomes acquainted with Lana's friends. After the party, Joel and Lana make love on the Chicago "L".

The next morning, when Joel comes home after retrieving his father's car from the repair shop, he finds that his house has been burglarized. When he tries to call Lana, Guido answers; he tells him he will let Joel buy back his furniture. Joel and his friends manage to get everything moved back in just as his parents walk in, though his mother notices a crack in her egg. Later, Joel's father congratulates him; the interviewer was very impressed, and Joel will be accepted into Princeton.

Joel meets Lana at a restaurant, and they speculate about their future. She tells him that she wants to keep on seeing him; he jokes that it will cost her.

• Tom Cruise as Joel Goodsen
• Rebecca De Mornay as Lana
• Joe Pantoliano as Guido
• Nicholas Pryor as Mr. Goodsen
• Janet Carroll as Mrs. Goodsen
• Richard Masur as Bill Rutherford
• Curtis Armstrong as Miles Dalby
• Bronson Pinchot as Barry
• Shera Danese as Vicki
• Raphael Sbarge as Glenn
• Bruce A. Young as Jackie
• Kevin Anderson as Chuck
• Nathan Davis as Business Teacher
• Fern Persons as Lab Teacher
• Anne Lockhart as Babysitter
• Megan Mullally as call girl

Sean Penn, Gary Sinise, Kevin Bacon, John Cusack and Tom Hanks all auditioned for the role of Joel Goodsen. Michelle Pfeiffer was offered the role of Lana, but turned it down.

The film was scored by Tangerine Dream. Their music comprises nearly half of the soundtrack album. Also included are songs by Muddy Waters, Prince ("DMSR"), Jeff Beck, Journey, Phil Collins ("In the Air Tonight"), and the song for which the film is best known, "Old Time Rock and Roll" by Bob Seger.

The soundtrack album was released on Virgin Records, Tangerine Dream's record company at the time of the film's release.

The film also includes "Hungry Heart" by Bruce Springsteen, "Every Breath You Take" by The Police, and "Swamp" by Talking Heads. The LP and CD versions of the soundtrack include two different versions of "Love on a Real Train (Risky Business)," both of which are different recordings from the version used in the film for the final love scene or closing credits.

Risky Business premiered in New York and Los Angeles on August 5, 1983.

The film was first released DVD on August 20, 1997 and on Blu-ray by Warner Bros. in 2008. Extra features included audio commentary with the director and Cruise, a featurette titled The Dream Is Always the Same: The Story of “Risky Business”, an alternate ending, screen tests and trailer. The Criterion Collection released the film on 4K Ultra HD and Blu-ray disc on July 23, 2024 with a new 4K digital restoration of both the director’s cut and original theatrical release, with bonus material from the 2008 Blu-ray release. New special features include interviews with Avnet and casting director Nancy Klopper and a conversation between editor Richard Chew and film historian Bobbie O’Steen.

The film opened in 670 theaters, with an opening weekend gross of $4,275,327. It went on to gross a total of $63.5 million domestically.

Risky Business is considered by many critics as one of the best films of 1983. Janet Maslin, in her 1983 review of the film for The New York Times, called it "part satire, part would-be suburban poetry and part shameless showing off" and said the film "shows an abundance of style", though "you would be hard pressed to find a film whose hero's problems are of less concern to the world at large." She called De Mornay "disarming as a call girl who looks more like a college girl" and credits Cruise with making "Joel's transformation from straight arrow to entrepreneur about as credible as it can be made".

The film holds a 93% rating on the review aggregate website Rotten Tomatoes based on 54 reviews, with an average of 7.3/10, with the site's consensus stating; "Featuring one of Tom Cruise's best early performances, Risky Business is a sharp, funny examination of teen angst that doesn't stop short of exploring dark themes". Roger Ebert's review was positive, calling it a film of:

Variety said the film was like a "promising first novel, with all the pros and cons that come with that territory" and complimented Brickman on "the stylishness and talent of his direction".

The film earned a 75 rating on Metacritic.

The remastered 25th-anniversary edition offers "both the upbeat studio ending and Mr. Brickman's original, more tentative and melancholic conclusion".

In 2015 the film was #31 on Entertainment Weekly's list of the 50 Best High School Movies. The magazine called the film a "sharp satire of privileged suburban teens", portraying the "soul-crushing pressure to be perfect."

In the years since the film's release, the iconic scene featuring Cruise's character sliding across the floor, dancing in just his pink shirt, socks, and white briefs to Bob Seger's rendition of "Old Time Rock and Roll" has been recreated in episodes of many television series, as well as in films, parodies, and advertisements. The song was #100 on AFI's 100 Years ... 100 Songs list.