• Jamie Foxx as Curtis Taylor Jr.; based upon Motown founder Berry Gordy Jr., Curtis is a slick Cadillac dealer-turned-record executive who founds the Rainbow Records label and shows ruthless ambition in his quest to make his black artists household names with white audiences. At first romantically involved with Effie, Curtis takes a professional and personal interest in Deena after appointing her lead singer of the Dreams in Effie's place.
• Beyoncé Knowles as Deena Jones; based upon Motown star and lead Supremes member Diana Ross, Deena is a very shy young woman who becomes a star after Curtis makes her lead singer of the Dreams. This, as well as her romantic involvement and later marriage to Curtis, draw Effie's ire, though Deena realizes over time she is a puppet for her controlling husband.
• Eddie Murphy as James (Jimmy) "Thunder" Early; inspired by R&B/soul singers such as James Brown, Jackie Wilson and Marvin Gaye, is a raucous performer on the Rainbow label engaged in an adulterous affair with Dreams member Lorrell. Curtis attempts to repackage Early as a pop-friendly balladeer. Jimmy's stardom fades as the Dreams' stardom rises, and as a result – he falls into depression (which he copes with through drug abuse).
• Danny Glover as Marty Madison, Jimmy's original manager before Curtis steps into the picture; Marty serves as both counsel and confidant to Jimmy, and later to Effie as well.
• Jennifer Hudson as Effie White; inspired by Supremes member Florence Ballard, Effie is a talented yet temperamental singer who suffers when Curtis, the man she loves, replaces her as lead singer of the Dreams and his love interest, and later drops her altogether. With the help of Jimmy's old manager Marty, Effie begins to resurrect her career a decade later, while raising her daughter Magic, the offspring of her union with Curtis.
• Anika Noni Rose as Lorrell Robinson; inspired by Supremes member Mary Wilson, is a good-natured background singer with the Dreams who falls deeply in love with the married Jimmy Early and becomes his mistress.
• Keith Robinson as Clarence Conrad (C.C.) White; inspired by Motown vice president, artist, producer, and songwriter Smokey Robinson, Effie's soft-spoken younger brother, a singer-songwriter, serves as the main songsmith for first the Dreams and later the entire Rainbow roster.
• Sharon Leal as Michelle Morris; based upon three Supremes members Cindy Birdsong, Lynda Laurence, and Susaye Greene, Curtis' secretary who replaces Effie in the Dreams and begins dating C.C.
• Hinton Battle as Wayne, a salesman at Curtis' Cadillac dealership who becomes Rainbow's first record producer and Curtis' henchman.
• Mariah I. Wilson as Magic White, Effie's daughter
• Yvette Cason as May, Deena's mother
• Ken Page (in his final film role) as Max Washington
• Michael-Leon Wooley as Tiny Joe Dixon

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In the 1980s and 1990s, several attempts were made to produce a film adaptation of Dreamgirls, a Broadway musical loosely based upon the story of The Supremes and Motown Records, which won six Tony Awards in 1982. David Geffen, the stage musical's co-financier, retained the film rights to Dreamgirls and turned down many offers to adapt the story for the screen. He cited a need to preserve the integrity of Dreamgirls stage director Michael Bennett's work after his death in 1987. That same year, Geffen, who ran his Warner Bros.-associated Geffen Pictures film production company at the time, began talks with Broadway lyricist and producer Howard Ashman to adapt it as a star vehicle for Whitney Houston, who was to portray Deena. The production ran into problems when Houston wanted to sing both Deena and Effie's songs (particularly "And I Am Telling You I'm Not Going"), along with Ashman's death in 1991, and the film was eventually abandoned.

When Geffen co-founded DreamWorks in 1994 and dissolved Geffen Pictures, the rights to Dreamgirls remained with Warner Bros. Warner planned to go ahead with the film with director Joel Schumacher and screenwriter Tina Andrews in the late 1990s, following the success of Touchstone Pictures's Tina Turner biopic What's Love Got to Do with It. Schumacher planned to have Lauryn Hill portray Deena and Kelly Price play Effie. After Warner's Frankie Lymon biopic Why Do Fools Fall in Love failed at the box office, the studio shut down development on Dreamgirls.

DreamWorks' Dreamgirls adaptation came about after the film version of the Broadway musical Chicago was a success at both the box office and the Academy Awards. Screenwriter and director Bill Condon, who wrote Chicago's screenplay, met producer Laurence Mark at a Hollywood holiday party in late 2002, where the two discussed a long-held "dream project" of Condon's – adapting Dreamgirls for the screen. The two had dinner with Geffen and successfully convinced him to allow Condon to write a screenplay for Dreamgirls. Condon did not start work on the Dreamgirls script until after making the Alfred Kinsey biographical film Kinsey (2004). After sending Geffen the first draft of his screenplay in January 2005, Condon's adaptation of Dreamgirls was greenlit.
While much of the stage musical's story remains intact, a number of significant changes were made. The Dreams' hometown—the setting for much of the action—was moved from Chicago to Detroit, the real-life hometown of The Supremes and Motown Records. The roles of many of the characters were related more closely to their real-life inspirations, following a suggestion by Geffen.

Warner Bros. had retained the film rights to Dreamgirls, and agreed to co-produce with DreamWorks. However, after casting was completed, the film was budgeted at $73 million and Warner backed out of the production. Geffen, taking the role of co-producer, brought Paramount Pictures in to co-finance and release Dreamgirls. During the course of production, Paramount's parent company, Viacom, would purchase DreamWorks, aligning the two studios under one umbrella (and giving the senior studio US distribution rights on behalf of DreamWorks). The completed film had a production budget of $75 million, making Dreamgirls the most expensive film with an all-black starring cast in ci…

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Dreamgirls premiered on December 4, 2006, at the Ziegfeld Theatre in New York City, where it received a standing ovation. The film's Los Angeles premiere was held on December 11 at the Wilshire Theater in Beverly Hills.

Similar to the releases of older Hollywood musicals such as The Sound of Music, My Fair Lady, and West Side Story, Dreamgirls debuted with three special ten-day roadshow engagements beginning on December 15, 2006, at the Ziegfeld Theatre in New York City, the Cinerama Dome in Los Angeles, and the AMC Metreon 15 in San Francisco. Tickets for the reserved seats were $25 each; the premium price included a forty-eight page full-color program and a limited-print lithograph. This release made Dreamgirls the first American feature film to have a roadshow release since Man of La Mancha in 1972. Dreamgirls earned a total of $851,664 from the roadshow engagements, playing to sold-out houses on the weekends. The film's national release, at regular prices, began on December 25. Outside of the U.S., Dreamgirls opened in Australia on January 18, and in the United Kingdom on February 2. Releases in other countries began on various dates between January and early March. Dreamgirls eventually grossed $103 million in North America, and almost $155 million worldwide.

DreamWorks Home Entertainment released Dreamgirls to home video on May 1, 2007 in DVD, HD DVD, and Blu-ray formats. The DVD version was issued in two editions: a one-disc standard version and a two-disc "Showstopper Edition". The two-disc version also included a feature-length production documentary, production featurettes, screen tests, animatics, and other previsualization materials and artwork. Both DVD versions featured alternative and extended versions of the musical numbers from the film as extras, including the "Effie, Sing My Song" scene deleted during previews. Both the Blu-ray and HD DVD versions were issued in two-disc formats. Dreamgirls was the first DreamWorks film to be issued in a high definition home entertainment format. As of 2017 , total domestic video sales to date are at $95.1 million.

A "Director's Extended Edition" of Dreamgirls was released on Blu-ray and Digital HD on October 10, 2017, by Paramount Home Media Distribution. This version, based on edits done for preview screenings before the film's release, runs ten minutes longer than the theatrical version and features longer musical numbers (including songs and verses cut during previews) and additional scenes.