 | Joaquin Phoenix als Arthur Fleck / Joker |
 | Robert De Niro als Murray Franklin |
 | Zazie Beetz als Sophie Dumond |
 | Frances Conroy als Penny Fleck |
 | Brett Cullen als Thomas Wayne |
 | Shea Whigham als Detective Burke |
 | Bill Camp als Detective Garrity |
 | Glenn Fleshler als Randall |
 | Leigh Gill als Gary |
 | Josh Pais als Hoyt Vaughn |
 | Rocco Luna als GiGi Dumond |
 | Marc Maron als Gene Ufland |
 | Sondra James als Dr. Sally |
 | Murphy Guyer als Barry O'Donnell |
 | Douglas Hodge als Alfred Pennyworth |
 | Dante Pereira-Olson als Bruce Wayne |
 | Carrie Louise Putrello als Martha Wayne |
 | Sharon Washington als Social Worker |
 | Hannah Gross als Young Penny |
 | Frank Wood als Dr. Stoner |
 | Brian Tyree Henry als Carl (Arkham Clerk) |
 | April Grace als Arkham Psychiatrist |
 | Mick Szal als Woman on Subway |
 | Carl Lundstedt als Wall Street Three |
 | Michael Benz als Wall Street Three |
 | Ben Warheit als Wall Street Three |
 | Gary Gulman als Comedian |
 | Sam Morril als Open Mic Comic |
 | Chris Redd als Comedy Club Emcee |
 | Mandela Bellamy als Mother on Bus |
 | Demetrius Dotson II als Boy on Bus |
 | Greer Barnes als Haha's Clown |
 | Ray Iannicelli als Haha's Clown |
 | Bryan Callen als Haha's Stripper |
 | Peter Hans Benson als Good Morning Host |
 | Vito Gerbino als Street Kid |
 | Adam Quezada als Street Kid |
 | Xavyer Ureña als Street Kid |
 | Evan Rosado als Street Kid |
 | Damian Emmanuel als Street Kid |
 | Mike Troll als Clown Protestor |
 | Jane Fergus als IBN Anchorwoman |
 | David Gibson als WBC News Anchor |
 | Tony D. Head als WGC Anchorman |
 | Jeff McCarthy als NCB Anchor |
 | Kim Brockington als NCB Co-Anchor |
 | Troy Roberts als NCB News Reporter |
 | Lou Young als ANC News Reporter |
 | Michael-Scott Druckenmiller als Paramedic |
 | Craig Austin als Paramedic |
 | John Cenatiempo als Aftermath Police Officer |
 | Danny Schoch als Aftermath Police Officers |
 | Keith Buterbaugh als Band Leader |
 | James Ciccone als Murray Franklin Band |
 | Rich Campbell als Murray Franklin Band |
 | Roger Squitero als Murray Franklin Band |
| Steven Elson als Murray Franklin Band |
| Graham Mabry als Murray Franklin Band |
| John Alldred als Murray Franklin Band |
 | Alonzo Wright als Murray Franklin Band |
| Jack Wilkins als Murray Franklin Band |
| Richard Baratta als Murray Franklin Band |
 | Mary Kate Malat als Murray Franklin Intern |
 | Adrienne Acevedo Lovette als Middle Aged Woman (uncredited) |
 | Justin Theroux als Ethan Chase (uncredited) |
 | Alissa Bourne als Anna (uncredited) |
 | Jamaal Burcher als Hospital Visitor / Mfs Audience (uncredited) |
 | John Cashin als Arkham Patient (uncredited) |
| Jason John Cicalese als Protester / Rioter (uncredited) |
 | Brendan Patrick Connor als Mr. Slotnick (uncredited) |
 | Blaise Corrigan als Taxi Driver (uncredited) |
 | Dennis Jay Funny als Gotham Citizen (uncredited) |
| James P. Harkins als Thomas Wayne's Body Guard (uncredited) |
| Joseph Hernandez als Protester / Rioter (uncredited) |
| Ben Heyman als Protestor (uncredited) |
| Graham Maby als Murray Franklin Band (uncredited) |
 | Jesse Schratz als Gotham City Sick Kid (uncredited) |
 | Isabella Ferreira als Flirting Woman on the Bus (uncredited) |
 | Shade Rupe als Bartender |
| Todd Phillips | Producer |
| Bradley Cooper | Producer |
| Emma Tillinger Koskoff | Producer |
| Todd Phillips | Writer |
| Scott Silver | Writer |
| Jeff Groth | Editor |
| Lawrence Sher | Director of Photography |
| Hildur Guðnadóttir | Original Music Composer |
| Richard Baratta | Executive Producer |
| Joseph Garner | Executive Producer |
| Shayna Markowitz | Casting |
| Mark Bridges | Costume Design |
| Mark Friedberg | Production Design |
| Timothy Metzger | Leadman |
| Bruce Berman | Executive Producer |
| Aaron L. Gilbert | Executive Producer |
| Walter Hamada | Executive Producer |
| Michael Uslan | Executive Producer |
| David Webb | Co-Producer |
| Lawrence Sher | Cinematography |
| Laura Ballinger | Supervising Art Director |
| Nicki Ledermann | Makeup Department Head |
| Kay Georgiou | Hair Department Head |
| Kris Moran | Set Decoration |
| G. A. Aguilar | Stunt Coordinator |
| Airon Armstrong | Stunt Double |
| Frank Alfano | Stunts |
| Brian Adler | Visual Effects |
| Bob Kane | Characters |
| Bill Finger | Characters |
| Jerry Robinson | Characters |
| Randall Poster | Music Supervisor |
| George Drakoulias | Music Supervisor |
| Carla Raij | Unit Production Manager |
| David Webb | First Assistant Director |
| Jeremy Marks | Second Assistant Director |
| Jason Cloth | Co-Executive Producer |
| Anjay Nagpal | Co-Executive Producer |
| Edwin Rivera | Visual Effects Supervisor |
| Michael Arnold | Choreographer |
| Richard Burden | Stunts |
| Peter Epstein | Stunts |
| Stephen Izzi | Stunts |
| Josh Lakatos | Stunts |
| Hugh Sicotte | Concept Artist |
| Michael Auszura | Assistant Art Director |
| Jeffrey D. McDonald | Assistant Art Director |
| Ann Bartek | Assistant Art Director |
| Lauren Rockman | Assistant Art Director |
| Aimee Dombo Desmond | Assistant Art Director |
| Robert Pyzocha | Assistant Art Director |
| Matthew Jeffrey Sama | Assistant Art Director |
| Erica Hohf | Assistant Art Director |
| Mason Chesler | Assistant Art Director |
| Geoffrey Haley | "A" Camera Operator |
| Geoffrey Haley | Steadicam Operator |
| Gregory Irwin | First Assistant "A" Camera |
| Anthony Coan | Second Assistant "A" Camera |
| Tim Metivier | First Assistant "B" Camera |
| Sarah Guenther | Second Assistant "B" Camera |
| Nicholas Kay | Digital Imaging Technician |
| Carrie Wills | Camera Loader |
| Tod A. Maitland | Sound Mixer |
| Michael Scott | Boom Operator |
| Jerry Yuen | Utility Sound |
| David Michael Dabney | Video Assist Operator |
| Renee Burke | Script Supervisor |
| Steve Ramsey | Chief Lighting Technician |
| Ryan Webb | Assistant Chief Lighting Technician |
| Al Padilla | Lighting Technician |
| Connell Burke | Lighting Technician |
| Jonathan Rotberg | Lighting Technician |
| Timothy Healy | Lighting Technician |
| John Campbell | Lighting Technician |
| Jason Lanci | Rigging Gaffer |
| Tom Prate | Key Grip |
| Todd Giresi | Best Boy Grip |
| Carter Jones | Grip |
| Daniel Wong | Grip |
| Michael J. Prate | Grip |
| Michael Scarola | Grip |
| Timothy Montgomery | Grip |
| Martin Lowry | Grip |
| Tania Ribalow | Key Makeup Artist |
| Sunday Englis | Key Makeup Artist |
| Mitchell Beck | Key Hair Stylist |
| Carla White | Makeup Artist |
| Jerry Popolis | Hairstylist |
| Lindsey C. Brush | Assistant Costume Designer |
| Abby Walton | Assistant Costume Designer |
| Jennifer Bentley | Wardrobe Supervisor |
| Jesca Alfano | Costume Coordinator |
| Christy Guillermain | Key Costumer |
| Danielle Landry | Costumer |
| Gabriel Rivera | Costumer |
| Kimberly Baird | Costumer |
| Jennifer Harrington | Costumer |
| Monica Ruiz-Ziegler | Costumer |
| Yvette Helin | Tailor |
| Lawrence Bell | Tailor |
| Sandy Hamilton | Property Master |
| Joel Weaver | Assistant Property Master |
| Jessie Pellegrino | Props |
| Olivia Mae Davis | Props |
| Bobby Griffon | Picture Car Coordinator |
| Jeff Brink | Special Effects Coordinator |
| Doug Facciponti | Special Effects Supervisor |
| Lisa Dennis | Post Production Supervisor |
| Jeff Mee | First Assistant Editor |
| Ray Neapolitan | Assistant Editor |
| Thomas J. Cabela | Visual Effects Editor |
| Jason Ruder | Supervising Music Editor |
| Lena Glikson | Music Editor |
| Daniel Waldman | Music Editor |
| Alan Robert Murray | Supervising Sound Editor |
| Tom Ozanich | Sound Designer |
| Kira Roessler | Supervising Dialogue Editor |
| Kira Roessler | Supervising ADR Editor |
| John Joseph Thomas | Sound Effects Editor |
| Darren Maynard | Sound Effects Editor |
| Christian Wenger | Sound Effects Editor |
| Michael Dressel | Foley Supervisor |
| Willard Overstreet | Foley Editor |
| Kevin Murray | Foley Editor |
| Cameron Steenhagen | Dialogue Editor |
| Tom Ozanich | Sound Re-Recording Mixer |
| Dean A. Zupancic | Sound Re-Recording Mixer |
| Ryan Young | Sound Mix Technician |
| Unsun Song | Sound Mix Technician |
| Tony Pilkington | Sound Engineer |
| Ryan Murphy | Sound Engineer |
| Thomas J. O'Connell | ADR Mixer |
| Dan O'Connell | Foley Artist |
| John T. Cucci | Foley Artist |
| Richard Duarte | Foley Mixer |
| Jack Cucci | Foley Mixer |
| Leah Winkler | Production Office Coordinator |
| Joan Altman | Production Accountant |
| Michael Hall | Production Office Assistant |
| Ben Gatollari | Travel Coordinator |
| Will Limpert | Production Secretary |
| Joyce Hsieh | First Assistant Accountant |
| Kerry Roberts | Payroll Accountant |
| Susan Strine | Assistant Accountant |
| Ramona Wong | Assistant Accountant |
| Ann Imai | Assistant Accountant |
| Kathryn Mell | Assistant Accountant |
| Evan Reed | Assistant Accountant |
| Ke Ze Lui | Assistant Accountant |
| Suzette Baker | Assistant Accountant |
| Sam Hutchins | Location Manager |
| Benjamin J. Stern | Assistant Location Manager |
| Katherine Delaney | Assistant Location Manager |
| Karen T. Salva | Assistant Location Manager |
| Dan Welch | Assistant Location Manager |
| Alec Bates | Location Coordinator |
| Kevin Harrigan | Transportation Captain |
| Thomas Aquino | Transportation Co-Captain |
| Ashley Wellbrock | Assistant Set Decoration |
| Theo Sena | Set Decoration Buyer |
| Shannon Nallan | Set Decoration Buyer |
| Mariella Navarro | Art Department Coordinator |
| Nara DeMuro | Art Department Coordinator |
| Miccah Underwood | Art Department Coordinator |
| Candis Heiland | Set Dresser |
| Roman Greller | Set Dresser |
| Dan Decelle | Set Dresser |
| Janine Pesce | Set Dresser |
| Joseph E. Petruccio | Set Dresser |
| Joe Taglairino | Set Dresser |
| John Schabel | Set Dresser |
| Chris Heike | Set Dresser |
| Ted Altman | Set Dresser |
| Henry Antonacchio | Head Carpenter |
| Michael Scarola | Key Construction Grip |
| Mike Bloecker | Carpenter |
| Robert Iversen | Carpenter |
| Mike Rich | Carpenter |
| Spencer Lasky | Shop Electric |
| Elizabeth Linn | Charge Scenic Artist |
| Will Scheck | Greensman |
| Larry Kaplan | Unit Publicist |
| Niko Tavernise | Still Photographer |
| Juliana Hatkoff | Producer's Assistant |
| Justine Conte | Producer's Assistant |
| Candice Alustiza-Lee | Casting Associate |
| Matthew Claar | Casting Assistant |
| Grant Wilfley | Extras Casting |
| Faith Maciolek | Extras Casting Assistant |
| Courtney Battles | Extras Casting Assistant |
| Ryan Robert Howard | Second Second Assistant Director |
| LeMicah Levert | Post Production Assistant |
| Wilson Rivas | Craft Service |
| Silvia Veronica Cadmilema | Craft Service |
| Brice R. Parker | Visual Effects Producer |
| Carolyn Shea | Visual Effects Coordinator |
| Mathew Giampa | Visual Effects Supervisor |
| Patrice Cormier | Visual Effects Producer |
| Jeff Atmajian | Orchestrator |
| Daniel Kresco | Scoring Mixer |
| Meghan Currier | Music Coordinator |
| Joseph S. Alfieri | Construction Coordinator |
| Jill Bogdanowicz | Digital Intermediate Colorist |
| Jason Saulog | Digital Intermediate Editor |
| Cindy Bond | Digital Intermediate Producer |
| Kim Jennings | Storyboard Artist |
| Todd Phillips | Director |
| Carolina Jiménez | Layout |
| Jordan Felix | Trainee Production Coordinator |
| Charles Zambrano | Makeup Artist |
| Eric Mancha | VFX Artist |
| Peter Steffan | VFX Artist |
| Morteza Rahdani | Makeup & Hair |
| Juliet Ouyoung | Set Costumer |
| James Massenburg | Set Costumer |
| Huey Carroll | VFX Artist |
| Matthew Mullarkey | VFX Artist |
| Steven John Brown | Stunts |
| Brian Bolland | Thanks |
| J. M. DeMatteis | Thanks |
| Keith Giffen | Thanks |
| Frank Miller | Thanks |
| Irv Novick | Thanks |
| John Cenatiempo | Stunts |
| Chris Cenatiempo | Stunts |
| Jill Brown | Stunts |
| Nitasha Bhambree | Stunts |
