 | Ezra Miller als Barry Allen / The Flash |
 | Sasha Calle als Kara Zor-El / Supergirl |
 | Michael Keaton als Bruce Wayne / Batman |
 | Michael Shannon als General Zod |
 | Ron Livingston als Henry Allen |
 | Maribel Verdú als Nora Allen |
 | Kiersey Clemons als Iris West |
 | Antje Traue als Faora-Ul |
 | Saoirse-Monica Jackson als Patty Spivot |
 | Rudy Mancuso als Albert Desmond |
 | Ed Wade als Court Reporter |
 | Jeremy Irons als Alfred Pennyworth |
 | Temuera Morrison als Thomas Curry |
 | Sanjeev Bhaskar als David Singh |
 | Sean Rogers als Gary |
 | Kieran Hodgson als Sandwich Guy |
 | Luke Brandon Field als Al Falcone |
 | Ian Loh als Kid Barry |
 | Karl Collins als Henry's Lawyer |
 | Nikolaj Coster-Waldau als Pizza Guy |
 | Poppy Shepherd als Flash Fan |
 | Nina Barker-Francis als Flash Fan |
| Ava Hamada als Flash Fan |
| Maurice Chung als Flash Fan |
| Florence Wright als Baby Nurse |
 | Bastian Antonio Fuentes als Tony's Son |
 | Andoni Gracia als Tony |
| Alex Hank als Security Guard |
| Miki Muschietti als Crying Toddler |
| Rebecca Hiller als Toddler's Mother |
| Rob Hunt als Falcone's Crew |
| Jonny Stockwell als Falcone's Crew |
| Michael Byrch als Falcone's Crew |
| Bret Jones als Neighbour with Dog |
 | Sue Maund als Neighbour with Dog |
 | Alex Batareanu als Russian Captain |
 | Andrei Nova als Russian Guard |
 | Gabriel Constantin als Head Scientist |
 | Oleg Mirochnikov als Scientist |
 | Katia Elizarova als Scientist |
 | Denis Khoroshko als Scientist |
 | Zsuzsa Magyar als Scientist |
 | Michael Lerman als Scientist |
 | Rosie Ede als Thomas Curry's Wife |
 | Andy Muschietti als Hot Dog Reporter |
| Ellie Rawnsley als Metropolis Reporter |
 | Greg Lockett als Gotham Reporter |
 | Chelsea Leigh Macleod als Gotham Reporter |
| Leslie Soo als Staff Nurse |
| Freya Evans als Woman in Park |
 | Sue Moore als Woman with Shopping Cart |
 | Lynn Farleigh als Judge |
| Martin Pemberton als Ambulance Driver |
| Sarah Lawn als Magician |
| David Calvitto als Batman Suit Performer |
 | Ben Affleck als Bruce Wayne / Batman (uncredited) |
 | Gal Gadot als Diana Prince / Wonder Woman (uncredited) |
 | George Clooney als Bruce Wayne (uncredited) |
 | Jason Momoa als Arthur Curry / Aquaman (uncredited) |
| Harry Lampert | Characters |
| Gardner Fox | Characters |
| Walter Hamada | Executive Producer |
| Andy Muschietti | Director |
| Christina Hodson | Screenplay |
| Paul D. Austerberry | Production Design |
| Michael Disco | Producer |
| Bárbara Muschietti | Producer |
| Marianne Jenkins | Executive Producer |
| Benjamin Wallfisch | Original Music Composer |
| Alexandra Byrne | Costume Design |
| Henry Braham | Director of Photography |
| Jason Ballantine | Editor |
| Paul Machliss | Editor |
| Jason Knox-Johnston | Supervising Art Director |
| Steven Lawrence | Art Direction |
| Marco Anton Restivo | Art Direction |
| Galen Vaisman | Executive Producer |
| John Francis Daley | Screenstory |
| Jonathan Goldstein | Screenstory |
| Julia Dehoff | Art Direction |
| Laura Mickiewicz | Art Direction |
| Emmy Beech | Makeup Artist |
| Victoria Down | Makeup Designer |
| Marzenna Fus-Mickiewicz | Makeup Artist |
| Carmel Jackson | Makeup Artist |
| Gabor Kerekes | Makeup Supervisor |
| Mike Smithson | Makeup Artist |
| Felicity Hickman | Set Dresser |
| Dominic Capon | Set Decoration |
| Will Houghton-Connell | Assistant Art Director |
| Christine Lois | Assistant Art Director |
| Dominique Law | Assistant Art Director |
| Sian Midgley | Standby Art Director |
| Paul Savulescu | Assistant Art Director |
| Brandon Jones | Sound Designer |
| Randy Torres | Sound Effects Editor |
| Greg ten Bosch | Sound Effects Editor |
| Nancy Nugent | Supervising Sound Editor |
| Katie Jones | Set Costumer |
| Toby Emmerich | Executive Producer |
| Andrew Lockley | Visual Effects Supervisor |
| Leonardo Costa | Visual Effects Supervisor |
| Bryan Hirota | Visual Effects Supervisor |
| Brad Minnich | Visual Effects Supervisor |
| Scott Vosbury | Visual Effects Supervisor |
| Robert Kanigher | Characters |
| Carmine Infantino | Characters |
| Michael Lerman | Co-Producer |
| Kim Baum | Music Supervisor |
| John 'D.J.' Des Jardin | Visual Effects Supervisor |
| Tamara Watts Kent | Visual Effects Producer |
| Rich Delia | Casting |
| Kate Ringsell | Casting |
| Joby Harold | Screenstory |
| Bob Kane | Characters |
| Bill Finger | Characters |
| William Moulton Marston | Characters |
| Matías Lértora | Thanks |
| Rob Cowan | Thanks |
| Jeffrey Wetzel | Thanks |
| Nikolaj Coster-Waldau | Thanks |
| Jack White | Thanks |
| Mike Baron | Thanks |
| John Broome | Thanks |
| Dave Johnson | Thanks |
| Francis Manapul | Thanks |
| Frank Miller | Thanks |
| George Pérez | Thanks |
| Joe Quinones | Thanks |
| Curt Swan | Thanks |
| Cary Bates | Thanks |
| Ramona Fradon | Thanks |
| Scott Kolins | Thanks |
| David Mazzucchelli | Thanks |
| Paul Norris | Thanks |
| Harry G. Peter | Thanks |
| Jerry Robinson | Thanks |
| Mort Weisinger | Thanks |
| Otto Binder | Thanks |
| Geoff Johns | Thanks |
| Andy Kubert | Thanks |
| Mark Millar | Thanks |
| Irv Novick | Thanks |
| Al Plastino | Thanks |
| Dick Sprang | Thanks |
| Marv Wolfman | Thanks |
| Aidan Brindle | Stunt Driver |
| Liam Coote | Stunt Double |
| Ashley Beck | Stunt Double |
| Adam Bowman | Stunt Double |
| Joel Conlan | Stunt Driver |
| Paul Bailey | Stunt Driver |
| Rick English | Stunt Double |
| Claudia Heinz | Stunt Double |
| Talila Craig | Utility Stunts |
| Eunice Huthart | Stunt Coordinator |
| Isaac Hamon | Stunt Coordinator |
| Kenny Knight | Stunt Double |
| Joseph Paxton | Stunt Double |
| Lee Millham | Stunt Driver |
| Matt Sherren | Stunt Driver |
| Elizabeth Donker Curtius | Stunts |
| Jordan Weaver | Other |
| Lucy Allen | Stunts |
| Deanna Marshall | Assistant Accountant |
| Paul Biddiss | Military Consultant |
| Jerry Siegel | Characters |
| Joe Shuster | Characters |
| Manraj Bhari | Visual Effects Production Assistant |
| Colin Nicolson | Production Sound Mixer |
