All 112 actors in both Dexter and ER
112 actors have appeared in both Dexter and ER, across 427 episodes. The most-credited is Lyn Alicia Henderson, Roni in Dexter and Paramedic Pamela Olbes in ER.
| Actor | In Dexter | In ER | Eps | Eps |
|---|---|---|---|---|
| Lyn Alicia Henderson | Roni | Paramedic Pamela Olbes | 1 | 149 |
| Scott Grimes | Alex Tilden | Dr. Archie Morris | 1 | 26 |
| Dominic Janes | Young Dexter | Alex Taggart | 5 | 22 |
| Aimee Garcia | Jamie Batista | Leanne Lawler | 22 | 1 |
| April L. Hernandez | Officer Cira Manzon | Nurse Inez | 8 | 7 |
| Glenn Plummer | Jimmy | Timmy Rawlins | 1 | 15 |
| Mary Mara | Valerie Hodges | Loretta Sweet | 3 | 9 |
| Julie Ann Emery | Fiona Camp | Paramedic Niki Lumley | 1 | 6 |
| Mark Pellegrino | Paul Bennett | Nathan Conley | 7 | 1 |
| Brad William Henke | Tony Tucci | John | 4 | 1 |
| Raphael Sbarge | Jim McCourt | Mr. Kirkendall | 3 | 2 |
| Judith Scott | Lt. Esme Pasquale | Mandy Smith | 5 | 1 |
| Scott Michael Campbell | Norm | EMT Reilly Brown | 1 | 7 |
| Demetrius Grosse | Alex Timmons, Morgue Attendant | Officer Newkirk | 2 | 5 |
| Roger Ranney | Nick Smith | Officer Maser | 3 | 1 |
| Michael Patrick McGill | Troy | Detective Ed Bernstein, Security #1, Officer Jeffries | 1 | 6 |
| Germaine De Leon | Nick, Intruder | Bale | 5 | 1 |
| Monique Gabriela Curnen | Yelina | Nurse Blanca | 2 | 1 |
| Rolando Molina | Armando | Rolando | 1 | 5 |
| Silas Weir Mitchell | Ken Olson | Luis, Marcus Hainey | 1 | 2 |
| Barbara Tarbuck | Mrs. Sussman | Alice Presley | 1 | 1 |
| Kyle Davis | Steve Dorsey | Kyle | 3 | 1 |
| Steve Eastin | Bill Bennett | Lorenzo | 3 | 1 |
| George Gerdes | Landlord | Jim Riley | 1 | 2 |
| Hunter King | Teenage Debra | Julie O'Fallon | 2 | 1 |
| Shawn Hatosy | Boyd Fowler | Willis Peyton | 2 | 1 |
| Adam Lieberman | FBI Agent | Levine | 2 | 1 |
| Brett Rickaby | Inspector Phil Bosso | Vincent Hales | 2 | 1 |
| Eric Ladin | Dr. Turner | Pvt. Thomas Perry | 1 | 1 |
| Jonathan Banks | FBI Deputy Director Max Adams | Robert Truman | 2 | 1 |
| Liza Lapira | Yuki Amado | Christine | 1 | 2 |
| Mark L. Young | Jeremy Downs | Evan Hayes | 2 | 1 |
| Nestor Serrano | Hector Estrada | David Torres, CDC | 2 | 1 |
| Sam Witwer | Neil Perry | Tommy | 2 | 1 |
| Saxon Trainor | Hotel Clerk | Karen Simms | 2 | 1 |
| Eli Goodman | Detective Weiss | NICU Resident | 2 | 2 |
| Geoffrey Rivas | Handyman, Jorge Castillo | Haven | 2 | 1 |
| Kurt Caceres | Officer Martinez | Luis Sanchez | 2 | 1 |
| Suzanne Cryer | Tarla Grant | Toni Stillman | 2 | 1 |
| Amy Pietz | Dr. Kruper | Loren | 1 | 1 |
| Bubba Lewis | Tyler Barnes | Dennis | 1 | 1 |
| Lisa Kaminir | Prosecutor | Jessie | 1 | 1 |
| Kathrin Middleton | Doris Morgan | Wife | 2 | 1 |
| Mariana Klaveno | Professor Carissa Porter | Rebecca | 2 | 1 |
| Vernée Watson | Doake's Mother | April Wilson | 1 | 2 |
| Gino Montesinos | Sgt. Lopez | Officer Nunez | 2 | 1 |
| Michael Hyatt | Pre-school Admissions Director | Yvonne Devilliere | 1 | 1 |
| Stewart Skelton | Matthew Braun | John Taylor | 1 | 1 |
| José Zúñiga | Jorge Castillo | Eduardo Lopez | 1 | 2 |
| Cristos | Norberto Cervantes | Kingsley | 1 | 1 |
| Frederick Koehler | Neighbor | Benjamin Coe | 1 | 1 |
| Nadège August | Receptionist | Mrs. Lemonier | 1 | 1 |
| Andrew Hawkes | Guard, Machado | Hagan | 2 | 1 |
| Jack Guzman | Quinones | Morgan | 1 | 2 |
| Jeanette Miller | Old Neighbor | Beverly, Flora | 1 | 2 |
| Marty Ryan | Rental Agent | Brant | 1 | 2 |
| Colton James | Metalhead | Mickey | 1 | 2 |
| Rolando Millet | Court Official | McGlashan | 1 | 1 |
| Petrea Burchard | Art Buyer | Judge Amoroso | 1 | 2 |
| Eileen Grubba | Nurse | TV Reporter | 1 | 1 |
| Ian Patrick Williams | Stanley Beaudry | Supervisor | 1 | 1 |
| Lewis T. Powell | Driver | Workman | 1 | 1 |
| Marc MacAulay | Detective Dan | Frank | 1 | 1 |
| Wilmer Calderon | Teo | Mickey Stubbs | 1 | 1 |
| Al Vicente | Alberto | Luis | 1 | 1 |
| Angel Oquendo | FBI Handler | Thigh Patient | 1 | 1 |
| J.R. Cacia | Officer Gordon | Ogilvie | 1 | 1 |
| Kevin Brief | Boat Buyer | Walter Brosnich | 1 | 1 |
| Lizette Carrion | Shanda | Lizette | 1 | 1 |
| Michael Durrell | Attorney Stuart Frank | Bob Gilman | 1 | 1 |
| Terry Maratos | Paramedic | Garvey | 1 | 2 |
| Bunnie Rivera | Laline | Maria | 1 | 1 |
| Gabriel Salvador | Roberto | Eddie | 1 | 1 |
| Gary Kraus | Sheriff Burns | CJ | 1 | 1 |
| John Ciccolini | Novik | Gary Jones | 1 | 1 |
| Juan Carlos Cantu | Fauzi | Mr. Rodriguez | 1 | 1 |
| Luis Moncada | Julio Benes | Rogelio | 1 | 1 |
| Nick Jaine | Lead Forensics Tech | Scrub Nurse | 1 | 1 |
| Yolanda Snowball | Teacher | Neighbor | 1 | 1 |
| Albert Owens | Andrew Garrett | Cardiologist Zane | 1 | 1 |
| Alicia Lagano | Nikki | Tracy | 1 | 1 |
| Carlos Moreno Jr. | Ricardo | Mr. Ortiz | 1 | 1 |
| Douglas Bennett | Suspect | Martin | 1 | 1 |
| Julia Vera | Old Cuban Woman | Reina | 1 | 1 |
| Jullian Dulce Vida | Julio | Gang Shooter | 1 | 1 |
| Steven Lee Allen | Security Guard | Contractor | 1 | 1 |
| Bashir Gavriel | Starter | Teddy | 1 | 1 |
| Christine Barger | Pierced Chick | Heather | 1 | 1 |
| Christopher Goodman | Angry Driver | Andrew | 1 | 1 |
| Cooper Huckabee | Joe Nix | Hayes | 1 | 1 |
| Darryl Sivad | Minister | Colin | 1 | 1 |
| Jernard Burks | Driver | Expectant Father | 1 | 1 |
| June Angela | Doctor | Mariko | 1 | 1 |
| Sewell Whitney | Defense Lawyer | Tech | 1 | 1 |
| Steve Stapenhorst | Congenial Narrator | Thorn | 1 | 1 |
| Wayne Lopez | Juan Alonso | Benitez | 1 | 1 |
| Wendy Haines | Nurse | Avila | 1 | 1 |
| Carlease Burke | Assistant | Policewoman | 1 | 1 |
| Cesar Flores | Oscar | Oscar | 1 | 1 |
| Debbie Lee Carrington | Patty | Ginger Jones | 1 | 1 |
| Gina Morelli | Old Woman | Mirissa | 1 | 1 |
| Giovanni Lopes | Officer Nunez | Oscar Batista | 1 | 1 |
| Jason Ross-Azikiwe | Preacher | Fireman #1 | 1 | 1 |
| Jayden Lund | Supervisor | Workman #2 | 1 | 1 |
| Kim Estes | Fireman | Lieutenant Higgins | 1 | 1 |
| Geno Monteiro | Officer | Fred | 1 | 1 |
| Terry Woodberry | Tech | Cop | 1 | 1 |
| Wiley Pickett | Sheriff | Impaled Man | 1 | 1 |
| Amy Correa | Maracas Woman | Tina | 1 | 1 |
| Asante Jones | Officer Reece | Workman #1 | 1 | 1 |
| Christopher Darga | Security Guard | Wilson | 1 | 1 |
| Niko Posey | Concerned Citizen | Activist #2 | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.