| Billy Crystal | ... | Himself - Host |
| rest of cast listed alphabetically: |
| Shohreh Aghdashloo | ... | Herself - Nominee: Best Actress in a Supporting Role |
| Liam Aiken | ... | Himself |
| Denys Arcand | ... | Himself - Winner: Best Foreign Language Film |
| Sean Astin | ... | Himself |
 | George Axelrod | ... | Himself (Memorial Tribute) (archive footage) |
| Alec Baldwin | ... | Himself - Nominee: Best Actor in a Supporting Role / Presenter: Best Documentary Feature |
| William Baldwin | ... | Himself - Audience Member |
| Alan Bates | ... | Himself (Memorial Tribute) (archive footage) |
| Jack Black | ... | Himself - Co-Presenter: Best Original Song |
| Michael Blakey | ... | Himself |
| Béatrice Bonifassi | ... | Herself - Performer ("Belleville Rendez-vou") |
| Russell Boyd | ... | Himself - Winner: Best Cinematography (also archive footage) |
| Philippa Boyens | ... | Herself - Winner: Best Adapted Screenplay |
| Christopher Boyes | ... | Himself - Winner: Best Sound Mixing |
| Stan Brakhage | ... | Himself (Memorial Tribute) (archive footage) |
| Adrien Brody | ... | Himself - Presenter: Best Actress in a Leading Role |
| Charles Bronson | ... | Himself (Memorial Tribute) (archive footage) |
| Pierce Brosnan | ... | Himself - Presenter: Best Film Editing |
| Sandra Bullock | ... | Herself - Presenter: Best Sound Mixing and Best Sound Editing |
| T-Bone Burnett | ... | Himself - Performer: 'The Scarlet Tide' |
| Nicolas Cage | ... | Himself - Presenter: 'Master and Commander: The Far Side of the World' Film Clip |
| Art Carney | ... | Himself (Memorial Tribute) (archive footage) |
| Jim Carrey | ... | Himself - Presenter: Honorary Award to Blake Edwards |
| Keisha Castle-Hughes | ... | Herself - Nominee: Best Actress in a Leading Role |
| Benoît Charest | ... | Himself - Performer: 'Belleville Rendez-vous' |
| César Charlone | ... | Himself - Nominee: Best Cinematography (archive footage) |
| Patricia Clarkson | ... | Herself - Nominee: Best Actress in a Supporting Role |
| Phil Collins | ... | Himself - Presenter: Best Original Score |
| Sean Connery | ... | Himself - Opening Announcer |
| Randall William Cook | ... | Himself - Winner: Best Visual Effects |
| Chris Cooper | ... | Himself - Presenter: Best Actress in a Supporting Rol |
| Francis Ford Coppola | ... | Himself - Presenter: Best Adapted Screenplay |
| Sofia Coppola | ... | Herself - Winner: Best Original Screenplay / Nominee: Best Picture, Best Director / Co-Presenter: Best Adapted Screenplay |
| Elvis Costello | ... | Himself - Performer: 'The Scarlet Tide' |
| Jeanne Crain | ... | Herself (Memorial Tribute) (archive footage) |
| Shane Bitney Crone | ... | Himself |
| Hume Cronyn | ... | Himself (Memorial Tribute) (archive footage) |
| Tom Cruise | ... | Himself - Presenter: Best Director |
| Jamie Lee Curtis | ... | Herself - Presenter: Song Performances from 'A Mighty Wind, ' 'The Triplets of Belleville' |
| John Cusack | ... | Himself - Presenter: Best Documentary Short |
| Benicio Del Toro | ... | Himself - Nominee: Best Actor in a Supporting Role |
| Maryann DeLeo | ... | Herself - Winner: Best Documentary Short |
| Johnny Depp | ... | Himself - Nominee: Best Actor in a Leading Role |
| Ngila Dickson | ... | Herself - Winner: Best Costume Design |
| Michael Douglas | ... | Himself |
| Faye Dunaway | ... | Herself - Audience Member |
| Clint Eastwood | ... | Himself - Nominee: Best Picture, Best Director (archive footage) |
| Buddy Ebsen | ... | Himself (Memorial Tribute) (archive footage) |
| Blake Edwards | ... | Himself - Honorary Award Recipient |
| Jack Elam | ... | Himself (Memorial Tribute) (archive footage) |
| Adam Elliot | ... | Himself - Winner: Best Animated Short |
| Will Ferrell | ... | Himself - Presenter: Best Original Song |
| Takashi Fujii | ... | Matthew Minami from clip 'Lost in Translation' (archive footage) |
| Alex Funke | ... | Himself - Winner: Best Visual Effects |
| Jennifer Garner | ... | Herself - Host: Scientific and Technical Awards Banquet |
| Louis Gossett Jr. | ... | Himself - Audience Member |
| Christopher Guest | ... | Himself |
| Buddy Hackett | ... | Himself (Memorial Tribute) (archive footage) |
| Tom Hanks | ... | Himself - Presenter: Bob Hope Tribute |
| Marcia Gay Harden | ... | Herself - Nominee: Best Actress in a Supporting Role |
| Michael Hedges | ... | Himself - Winner: Best Sound Mixing |
| David Hemmings | ... | Himself (Memorial Tribute) (archive footage) |
| Dan Hennah | ... | Himself - Winner: Best Art Direction |
| Katharine Hepburn | ... | Herself (Special Memorial Tribute) (archive footage) |
| Wendy Hiller | ... | Herself (Memorial Tribute) (archive footage) |
| Gregory Hines | ... | Himself (Memorial Tribute) (archive footage) |
| Bob Hope | ... | Himself (Memorial Tribute) (archive footage) |
| Holly Hunter | ... | Herself - Nominee: Best Actress in a Supporting Role |
| Peter Jackson | ... | Himself - Winner: Best Picture, Best Director, Best Adapted Screenplay |
| Michael Jeter | ... | Himself (Memorial Tribute) (archive footage) |
| Scarlett Johansson | ... | Herself - Presenter: Best Makeup |
| Angelina Jolie | ... | Herself - Presenter: Best Art Direction |
| Elia Kazan | ... | Himself (Memorial Tribute) (archive footage) |
| Diane Keaton | ... | Herself - Nominee: Best Actress in a Leading Role |
| Nicole Kidman | ... | Herself - Presenter: Best Actor in a Leading Role |
| Peter King | ... | Himself - Winner: Best Makeup |
| Richard King | ... | Himself - Winner: Best Sound Editing |
| Ben Kingsley | ... | Himself - Nominee: Best Actor in a Leading Role |
| Alison Krauss | ... | Herself - Performer: 'You Will Be My Ain True Love, ' 'The Scarlet Tide' |
| Diane Lane | ... | Herself - Co-Presenter: Best Documentary Short |
| Hope Lange | ... | Herself (Memorial Tribute) (archive footage) |
| Jude Law | ... | Himself - Nominee: Best Actor in a Leading Role / Presenter: Best Cinematography |
| David Lebolt | ... | Himself - Accepting Award of Merit (pre-recorded) |
| Heath Ledger | ... | Himself - Audience Member |
| Alan Lee | ... | Himself - Winner: Best Art Direction |
| Annie Lennox | ... | Herself - Winner: Best Original Song / Performer: 'Into the West' |
| Joe Letteri | ... | Himself - Winner: Best Visual Effects |
| Eugene Levy | ... | Himself - Performer: 'A Kiss at the End of the Rainbow (as Mitch & Mickey) |
| Tobey Maguire | ... | Himself - Presenter: 'Seabiscuit' Film Clip |
| Grant Major | ... | Himself - Winner: Best Art Direction |
| Sean Mathias | ... | Himself |
| Michael McKean | ... | Himself - Nominee: Best Original Song |
| Ian McKellen | ... | Himself - Presenter: 'The Lord of the Rings: The Return of the King' Film Clip |
| Fernando Meirelles | ... | Himself - Nominee: Best Director (archive footage) |
| Ann Miller | ... | Herself (Memorial Tribute) (archive footage) |
| Julianne Moore | ... | Herself - Co-Presenter: Best Film Editing |
| Michael Moore | ... | Himself - Winner: Best Documentary Feature |
| Karen Morley | ... | Herself (Memorial Tribute) (archive footage) |
| Errol Morris | ... | Himself - Winner: Best Documentary Feature |
| Samantha Morton | ... | Herself - Nominee: Best Actress in a Leading Role |
| Bill Murray | ... | Himself - Presenter: 'Lost in Translation' Film Clip |
| David Newman | ... | Himself (Memorial Tribute) (archive footage) |
| Donald O'Connor | ... | Himself (Memorial Tribute) (archive footage) |
| Catherine O'Hara | ... | Perfomer: 'A Kiss at the End of the Rainbow' (as Mitch & Mickey) |
| Ron O'Neal | ... | Himself (Memorial Tribute) (archive footage) |
| Annette O'Toole | ... | Herself - Nominee: Best Original Song |
| Barrie M. Osborne | ... | Himself - Winner: Best Picture |
| Vanessa Paradis | ... | Herself - Audience Member |
| Peter Parks | ... | Himself - Gordon E. Sawyer Award Recipient (pre-recorded) (as Peter D. Parks) |
| Gregory Peck | ... | Himself (Memorial Tribute) (archive footage) |
| Hammond Peek | ... | Himself - Winner: Best Sound Mixing |
| Sean Penn | ... | Himself - Winner: Best Actor in a Leading Role |
| Frank Pierson | ... | Himself - Academy President: Presenting Memorial Tribute |
| Jada Pinkett Smith | ... | Herself - Co-Presenter: Best Visual Effects |
| Leni Riefenstahl | ... | Herself (Memorial Tribute) (archive footage) |
| John Ritter | ... | Himself (Memorial Tribute) (archive footage) |
| Miles Robbins | ... | Himself |
| Tim Robbins | ... | Himself - Winner: Best Actor in a Supporting Role / Presenter: Best Original Screenplay |
| Denise Robert | ... | Herself - Best Foreign Language Film Winner |
| Julia Roberts | ... | Herself - Presenter: Katharine Hepburn Tribute |
| Mickey Rooney | ... | Himself - Audience Member |
| Jim Rygiel | ... | Himself - Winner: Best Visual Effects |
| Andrew J. Sacks | ... | Himself - Winner: Best Live Action Short |
| Susan Sarandon | ... | Herself - Co-Presenter: Best Original Screenplay |
| John Schlesinger | ... | Himself (Memorial Tribute) (archive footage) |
| Aaron Schneider | ... | Himself - Winner: Best Live Action Short |
| John Schwartzman | ... | Himself - Nominee: Best Cinematography (archive footage) |
| John Seale | ... | Himself - Nominee: Best Cinematography (archive footage) |
| Jamie Selkirk | ... | Himself - Winner: Best Film Editing |
| Peter Sellers | ... | Insp. Jacques Clouseau (archive footage) |
| Michael Semanick | ... | Himself - Winner: Best Sound Mixing |
| Eduardo Serra | ... | Himself - Nominee: Best Cinematography (archive footage) |
| Marc Shaiman | ... | Himself - Conductor |
| Howard Shore | ... | Himself - Winner: Best Original Score, Best Original Song |
| Will Smith | ... | Himself - Presenter: Best Visual Effects |
| Steven Spielberg | ... | Himself - Presenter: Best Picture |
| Robert Stack | ... | Himself (Memorial Tribute) (archive footage) |
| Andrew Stanton | ... | Himself - Winner: Best Animated Feature |
| Ray Stark | ... | Himself (Memorial Tribute) (archive footage) |
| Ben Stiller | ... | Himself - Presenter: Best Live Short Film and Best Animated Short Film |
| Sting | ... | Himself - Co-Presenter: Best Score / Performer: 'You Will Be My Ain True Love' |
| Richard Taylor | ... | Himself - Winner: Best Costume Design, Best Makeup |
| Charlize Theron | ... | Herself - Winner: Best Actress / Presenter: Best Foreign Language Film |
| Uma Thurman | ... | Herself - Co-Presenter: Best Cinematography |
| Bill Tondreau | ... | Himself - Award of Merit Recipient (pre-recorded) |
| John Travolta | ... | Himself - Co-Presenter: Best Sound Mixing and Best Sound Editing |
| Liv Tyler | ... | Herself - Presenter: Best Song nominees "Into the West", "The Scarlet Tide", "You Will Be My Ain' True Love" |
| Fran Walsh | ... | Herself - Winner: Best Picture, Best Adapted Screenplay, Best Original Song |
| Naomi Watts | ... | Herself - Nominee: Best Actress in a Leading Role / Co-presenter: Best Documentary Feature |
| Michael Weaver | ... | Himself |
| Peter Weir | ... | Himself - Nominee: Best Picture, Best Director (archive footage) |
| Harold Wheeler | ... | Himself - Conductor |
| Michael Williams | ... | Himself - Winner: Best Documentary Feature |
| Robin Williams | ... | Himself - Presenter: Best Animated Feature |
| Owen Wilson | ... | Himself - Co-Presenter: Best Live Short Film and Best Animated Short Film |
| Oprah Winfrey | ... | Herself - Presenter: 'Mystic River' Film Clip |
| Elijah Wood | ... | Himself |
| Robin Wright | ... | Herself - Audience Member |
| Renée Zellweger | ... | Herself - Winner: Best Actress Supporting Role / Presenter: Best Costume Design |
| Catherine Zeta-Jones | ... | Herself - Presenter: Best Actor in a Supporting Role |
| Billy Boyd | ... | Himself (uncredited) |
| Jack Nicholson | ... | Himself as Gandalf in opening spoof segment (uncredited) |
company.