All 114 actors in both Supergirl and The Flash
114 actors have appeared in both Supergirl and The Flash, across 310 episodes. The most-credited is Patrick Sabongui, Captain David Singh in Supergirl and David Singh in The Flash.
| Actor | In Supergirl | In The Flash | Eps | Eps |
|---|---|---|---|---|
| Patrick Sabongui | Captain David Singh | David Singh | 1 | 45 |
| John Wesley Shipp | Barry Allen / The Flash (Earth-90) | Dr. Henry Allen, Jay Garrick / The Flash (Earth-3), Barry Allen / The Flash of Earth-90 | 1 | 29 |
| Andrea Brooks | Eve Teschmacher | Eve Teschmacher | 26 | 1 |
| Danielle Nicolet | DA Cecile Horton | DA Cecile Horton | 1 | 20 |
| Jon Cryer | Lex Luthor | Lex Luthor | 20 | 1 |
| Tom Cavanagh | Harrison Nash Wells / Pariah, Eobard Thawne / Reverse-Flash, Harrison Wells | Dr. Harrison Wells, Harrison Wolfgang Wells, Dr. Harrison "Harry" Wells / Earth-2 | 3 | 17 |
| Jessica Parker Kennedy | Wedding Caterer | Nora West-Allen | 1 | 14 |
| Melissa Benoist | Snowbird / Linda Lee / Red Daughter, Kara Zor-El (Earth-X) / Overgirl | Supergirl / Kara Zor-El / Kara Danvers, Kara Zor-El (Earth-X) / Overgirl | 10 | 5 |
| David Ramsey | John Diggle | John Diggle | 2 | 11 |
| Victor Garber | Dr. Martin Stein / Firestorm | Dr. Martin Stein / Firestorm, Digsy Foss' Husband, Professor Martin Stein | 1 | 12 |
| Emily Bett Rickards | Felicity Smoak | Felicity Smoak, Felicity Smoak (Earth-X) | 1 | 8 |
| Jesse L. Martin | Joe West | Joe West, Digsy Foss | 1 | 7 |
| Tyler Hoechlin | Superman / Kal-El / Clark Kent, Dr. John Deegan / Superman (Elseworlds) | Clark Kent / Superman | 6 | 2 |
| Brandon Routh | Ray Palmer / The Atom | Ray Palmer / The Atom, Clark Kent / Superman of Earth-96 | 1 | 5 |
| Jeremy Jordan | Winslow "Winn" Schott, Winslow Schott (Alternate Earth) / Toyman | Freedom Fighter General Schott, Grady | 4 | 2 |
| Stephen Amell | Oliver Queen / Green Arrow, Oliver Queen (Earth-X) / Dark Arrow, Oliver Queen / Green Arrow (Earth-16) | Oliver Queen / Arrow, Oliver Queen (Earth-X) / Dark Arrow | 3 | 9 |
| Arran Henn | Newscaster | CatCo Reporter | 10 | 1 |
| Keiynan Lonsdale | Wally West / Kid Flash | Wallace "Wally" West | 1 | 4 |
| Phil LaMarr | Malefic J'onzz | Rag Doll | 7 | 3 |
| David Harewood | Hank Henshaw / Cyborg Superman | Hank Henshaw / J'onn J'onzz / Martian Manhunter | 5 | 2 |
| Audrey Marie Anderson | Lyla Michaels / Harbinger | Lyla Michaels / Harbinger | 1 | 5 |
| Robert Zen Humpage | Fish Head | Saul Frankel | 12 | 1 |
| Nickolas Baric | Acolyte #2, Infernian Attacker, Rabbit #1 | Security Guard #1, Thug #2 | 4 | 3 |
| Carlos Valdés | Cisco Ramon / Vibe | Echo, Francisco Ramon / Reverb (Earth-2), Pablo | 3 | 3 |
| Franz Drameh | Jefferson "Jax" Jackson / Firestorm | Jefferson "Jax" Jackson / Firestorm | 1 | 3 |
| Dominic Purcell | Mick Rory / Heat Wave | Mick Rory | 1 | 4 |
| Chris Wood | Mon-El | Mon-El, Tommy Moran | 2 | 1 |
| Paul Lazenby | Mandrax, Lead Fireman | Tech Thief #2 | 3 | 1 |
| Caity Lotz | Sara Lance / White Canary | Sara Lance / White Canary | 2 | 3 |
| Danielle Panabaker | Caitlin Snow / Killer Frost | Caitlin Snow / Killer Frost (Earth-2) | 2 | 3 |
| Sasha Piltsin | Kasnian Soldier | Bodyguard | 4 | 1 |
| Fred Henderson | Mayor | Coroner | 3 | 2 |
| Fulvio Cecere | Massimo | Officer Vukovich | 1 | 3 |
| Jason Bell | Cadmus Guard, COL 1 | Cop #2, Goon #1 | 2 | 3 |
| Jeremy Schuetze | Rob | Rob | 1 | 2 |
| Katherine McNamara | Mia Smoak / Blackstar | Mia Smoak | 1 | 2 |
| LaMonica Garrett | Mar Novu / The Monitor | The Monitor | 3 | 2 |
| Lisa Chandler | Bystander #2, Soccer Mom | Hazmat Woman | 2 | 1 |
| Chad Riley | Prison Guard | Foreman, Goon #2, Security Guard #1 | 1 | 3 |
| Frederick Schmidt | John Corben / Metallo | Metallo-X | 3 | 1 |
| Isabella Hofmann | Clarissa Stein | Clarissa Stein | 1 | 3 |
| Meghan Gardiner | Soccer Mom | Renee Wazzo | 1 | 3 |
| Reese Alexander | Warden | Museum Guard, Prison Guard #2 | 2 | 2 |
| Shawn Stewart | Muscular Alien | Mitch Romero | 1 | 3 |
| Bethany Brown | Instructor | Janet Petty / Null | 1 | 2 |
| Darcy Hinds | Control Room Guard, Dealer, Dynamorph | McCulloch Guard | 3 | 1 |
| Elizabeth Tulloch | Lois Lane | Lois Lane | 2 | 2 |
| John Gillich | Officer Chapman | Philip Master / Acid Master | 1 | 1 |
| Octavian Kaul | Luke | Young Hunter Zolomon | 1 | 1 |
| Herbert Duncanson | Male Passenger | Sergeant Bates | 1 | 2 |
| Nilo Ghajar | Inmate #2 | Guard, Visitor #2 | 1 | 2 |
| Fraser Aitcheson | COL 5, Head Guard | City Worker #2, Criminal Passenger, Prison Gang-Goon #1 | 2 | 3 |
| Darren Criss | Music Meister | Music Meister | 1 | 1 |
| Gary Starkell | Gary Forehead | Riggs Willington | 3 | 1 |
| Jason Mewes | Mississippi Farmer | Humvee Guy, Museum Guard | 1 | 2 |
| Judith Maxie | Judge Hobart | Theresa Markel | 1 | 1 |
| Kirby Morrow | Officer Dean Petrocelli | Coach | 3 | 1 |
| Malcolm Masters | Dr. Niles Jarrod | Guard #3 | 2 | 1 |
| Mike Carpenter | Robber #1 | Thug #1 | 1 | 1 |
| Paul Almeida | Cracked Mask Child of Liberty | Uniform Cop #1 | 1 | 2 |
| Sarwan Badesha | Onlooker | Cop #1 | 1 | 1 |
| Chad Bellamy | Bystander #3 | Goon #1, Prison Gang-Goon #2 | 1 | 2 |
| James Michalopolous | Goon 1, Igor Starros | Security Guard #1 | 2 | 1 |
| Ruby Rose | Kate Kane / Batwoman | Kate Kane / Batwoman | 2 | 1 |
| Andres Joseph | Man | Turbo | 1 | 1 |
| David Lee Forts | Meathead | Patron | 1 | 1 |
| Harrison MacDonald | Mummy Bro | Mold Inspector Rogen | 1 | 1 |
| Jan Bos | Governor Tom Harper | Dr. Hadley | 1 | 1 |
| Josh Chambers | First Local | Joey Monteleone / Tar Pit | 1 | 1 |
| Larry Hoe | David | Government Official | 1 | 1 |
| Rochelle Okoye | Finhead | Keisha Moore | 1 | 1 |
| Theresa Wong | ER Doctor | Lindsay Kang | 1 | 1 |
| Sasha Rojen | Martian Child #1 | Young Iris | 1 | 2 |
| Alex Stines | First Looter | Male Camper | 1 | 1 |
| Brandy Le | Production Assistant | Aircraft Marshaler | 1 | 1 |
| Charles Jarman | Guard #1 | Officer | 1 | 1 |
| Lisa MacFadden | Gal | Anne | 1 | 1 |
| Micah Steinke | Man on the Street | Nazi Soldier #1 | 1 | 1 |
| Mike McLeod | CoL Protestor | Shade | 1 | 1 |
| Paul Herbert | Scientist | Director Hackshaw | 1 | 2 |
| Paul Jarrett | Nelson Stewart | General Matthew McNally | 1 | 1 |
| Serge Jaswal | Navigator | Suit #2 | 2 | 1 |
| William MacDonald | James' Surgeon | Gene Huskk | 1 | 1 |
| Austin Anozie | Student Two | Teammate #2 | 1 | 1 |
| Jeremy Davies | Dr. John Deegan | Dr. John Deegan | 1 | 1 |
| Dominique Robinson | Young Adult Malefic | Officer Matlin | 1 | 1 |
| JoJo Ahenkorah | DEO Agent #1 | Security Guard | 1 | 1 |
| Kareem Malcolm | Another Student | Male Uni | 1 | 1 |
| Khamisa Wilsher | Assistant | McCulloch Guard #1 | 1 | 1 |
| Lauren Jackson | Handmaiden | Donna Winters | 1 | 1 |
| Phillip Mitchell | Drug Buyer | Security Guard | 1 | 1 |
| Scott Button | Man | Barista | 1 | 1 |
| Shayn Walker | Police Officer | Police Armorer | 1 | 1 |
| Demord Dann | Prison Guard | Security Guard | 1 | 1 |
| Ese Atawo | Counter Protestor | Detective Frankie Curtis | 1 | 1 |
| Kyle Strauts | Valeronian | Lars Patel | 1 | 1 |
| Mark Krysko | Head Guard | Security Guard #1 | 1 | 1 |
| Patrick Rinehart | Agent #2 | A.R.G.U.S. Guard | 1 | 1 |
| Ronald Patrick Thompson | Dr. Frank Gale | Samaritan | 1 | 1 |
| Scott McNeil | Toby | Julius | 1 | 1 |
| Sharon Bell | Older Woman | Female Restaurant Patron | 1 | 1 |
| Janet Glassford | Customer #2 | Surly Meta | 1 | 1 |
| Jesse Stretch | Bold Inmate | Truck | 1 | 1 |
| Mathew Yanagiya | Nerdy Computer Programmer | Man | 1 | 1 |
| Peter Hall | NPC-Abe Lincoln | Vincent Santini | 1 | 1 |
| Sean Kohnke | Creep | Police Officer #1 | 1 | 1 |
| Barbara Patrick | Woman | Bank Robber #3 | 1 | 1 |
| Marc Gaudet | NPC-MAC | Highway Patrolman | 1 | 1 |
| Tristan Shire | Terrified DEO Agent | Bartender | 1 | 1 |
| Candice Patton | Iris West | Millie Foss | 1 | 1 |
| Christina Brucato | Lily Stein | Lily Stein | 1 | 1 |
| Michael Brian | Dan | Suit #1 | 1 | 1 |
| Jaren Moore | Thack | Plumber | 1 | 1 |
| Russell Tovey | Ray Terrell / The Ray | Raymond Terrill / The Ray | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.