All 136 actors in both ER and Law & Order: LA
136 actors have appeared in both ER and Law & Order: LA, across 353 episodes. The most-credited is Paula Malcomson, Meg Riley in ER and Jill Jennings in Law & Order: LA.
| Actor | In ER | In Law & Order: LA | Eps | Eps |
|---|---|---|---|---|
| Paula Malcomson | Meg Riley | Jill Jennings | 8 | 1 |
| Andy Umberger | Dr. David Harvey | Chief Thompson | 2 | 2 |
| Elaine Kagan | Mrs. Shearer | Judge Sonia Hirsh | 1 | 2 |
| Harry Lennix | Dr. Greg Fischer | Agent Bossy | 6 | 1 |
| Clyde Kusatsu | Review Board Doctor #1 | Judge Bradley Rumford | 1 | 2 |
| Jonathan Scarfe | Chase Carter | Douglas Cantu | 8 | 1 |
| Conor O'Farrell | Richard Abbott | Defense Attorney Lane Garfield | 2 | 2 |
| Steven Culp | Dave Spencer, Dr. Charles Cameron | Ben Corrigan | 5 | 1 |
| Bradley Whitford | Sean O'Brien | Attorney Miklin | 2 | 1 |
| Currie Graham | James | Defense Attorney Max Hearn | 1 | 2 |
| Dean Norris | Bomb Specialist Clark | Bob Kentner | 1 | 1 |
| Patrick Fischler | Chamber Tech | Defense Attorney Josh Solomon | 1 | 1 |
| Raphael Sbarge | Mr. Kirkendall | Dennis Ackroyd | 2 | 1 |
| Dale Dickey | Mrs. Price | Sally Ricks | 1 | 1 |
| Jose Pablo Cantillo | Juan Enriquez | Caesar Vargas | 1 | 1 |
| Yara Martinez | Mia | Soledad Alvarado | 1 | 1 |
| John Prosky | Mr. Brooks | Dr. Gouldin | 4 | 1 |
| Bellamy Young | Grace | Monica Jarrow | 1 | 1 |
| Bob McCracken | Ring | Bob Reedy | 1 | 1 |
| Christopher Cousins | Kyle Kolber | Nelson's Lawyer | 1 | 1 |
| James Dalesandro | Mexican Man | Quintana | 1 | 1 |
| John Kapelos | Mr. Irby | Mark Buckley | 1 | 1 |
| Michael O'Neill | Col. Ken Kilner | Trudy's Attorney | 1 | 1 |
| Shawn Hatosy | Willis Peyton | Larry Sheppard | 1 | 1 |
| Tony Plana | Priest | Jorge Gomez | 1 | 1 |
| Shi Ne Nielson | Med Student Sheila | Hannah | 4 | 1 |
| Freda Foh Shen | Audiologist | Forrester's Lawyer | 3 | 1 |
| Elizabeth Penn Payne | Margie | Judge Nancy Morrow | 1 | 2 |
| Lee Tergesen | Mr. Mullen | Patrick Denton | 1 | 1 |
| Marco Sanchez | O'Connor | Felipe Pena | 1 | 1 |
| Robin Weigert | Nicole | Larry's Sister | 1 | 1 |
| Roxana Brusso | Mari Hinjosa | Ava Ruiz | 1 | 1 |
| Bobby Nish | Officer Danny Yau | SID Tech Takahashi | 4 | 1 |
| Al Pugliese | Angelo | Detective Kavanaugh | 1 | 2 |
| Bonnie Root | Lori | Maura Dillon | 1 | 1 |
| Charles Rahi Chun | Ben's Dad | Mitch Pellington | 1 | 1 |
| Dohn Norwood | MP, Mr. Persky | Mr. Tasker | 2 | 1 |
| K Callan | Kelly Robinson | Louise Hammond | 1 | 1 |
| Larry Clarke | Male Lawyer | Don Wheeler | 1 | 1 |
| Peter MacKenzie | Mr. Pasbalas | Attorney Simms | 1 | 1 |
| Shannon Lucio | Johanna Lambright | Kim Miller | 1 | 1 |
| Valeri Ross | McGillis | Sheila Watson | 4 | 1 |
| Alla Korot | Mrs. Dupont | Anna Ackroyd | 1 | 1 |
| Amanda Carlin | Librarian | Susan Foreman | 1 | 1 |
| Frederick Koehler | Benjamin Coe | SID Tech Gilbert | 1 | 1 |
| Jeff Kober | Stuart | Toomey | 1 | 1 |
| Marlene Forte | Mrs. Gonzalez | Inez Gomez | 1 | 1 |
| Nicki Micheaux | Mrs. Williams | Vanessa Hayes | 1 | 1 |
| Paul Vincent O'Connor | tbd | Judge Franklin Ridgeway | 1 | 1 |
| Scott Lawrence | Children's Services Rep | Judge | 1 | 1 |
| Steve Vinovich | Wayne Lentloff | Norman Swift | 2 | 1 |
| Glenn Taranto | O'Mally, Rizzo | Sergeant Greeley | 2 | 1 |
| J.R. Cacia | Ogilvie | Steve Holt | 1 | 1 |
| Randy Lowell | Dr. Shine | Dr. David Grant | 3 | 1 |
| Colby French | Greg Becton | Doug | 1 | 1 |
| Henri Lubatti | Victor | Doctor | 1 | 1 |
| Ivo Nandi | Emilio | Fedora Man | 1 | 1 |
| Jacqueline Hahn | Dr. Bazzano | Ms. Rathman | 1 | 1 |
| Ronnie Gene Blevins | Nemo Baker | Cal Gerrity | 1 | 1 |
| Vaughn Armstrong | Greg Mitchell | Mike Foreman | 1 | 1 |
| Al Vicente | Luis | Enrique Lopez | 1 | 1 |
| Andrew Rothenberg | Pauly Johnson | Stanley Vaughn | 1 | 1 |
| B.K. Cannon | Tammy | Samantha Lorber | 1 | 1 |
| Betty Carvalho | Mrs. Zevallo | Muriel | 1 | 1 |
| Ewan Chung | Chiu | Dylan | 1 | 1 |
| Joan McMurtrey | Birdwatcher | Rebecca's Mother | 1 | 1 |
| Lucinda Jenney | Allison | Professor | 1 | 1 |
| Michael Raynor | Joseph Morgan | Vince Braden | 1 | 1 |
| Jeris Lee Poindexter | Nate, Rafe | Homeless Man | 2 | 1 |
| J.J. Boone | Lenore Simkins | Desk Nurse | 1 | 1 |
| Jay Jablonski | Doug Bellamy | Barry Baitos | 1 | 1 |
| Jim Piddock | Dr. Earl Whitehead | Jay Bickson | 1 | 1 |
| John Rosenfeld | FBI Agent Robert Clayton | Ken Friedman | 1 | 1 |
| Kate McNeil | Mrs. Pendry | Patricia Nelson | 1 | 1 |
| Larry Herron | Mitch Kellems | Sgt. Daniel Bart | 1 | 1 |
| Lise Simms | Emcee | Coach Gayle Hanson | 1 | 1 |
| Michael Spound | Dwayne's Father | Dan Garrett | 1 | 1 |
| Robert Cicchini | Channel 5 Chopper Reporter | Restaurant Owner | 1 | 1 |
| Scott Klace | Chris Halpern | Fire Chief Gable | 1 | 1 |
| Tom Virtue | Pares | Rogan Malone | 1 | 1 |
| Jim Jansen | Neonatologist | Cameron Reardon | 1 | 1 |
| Josh Clark | Officer McCauly | SIS Commander | 1 | 1 |
| Karis Campbell | Mrs. Kenig | Carolyn Yarborough | 1 | 1 |
| Michael Hagiwara | Steve Sakabu | Foreperson | 1 | 1 |
| Susan Angelo | Mrs. Frum | Louise Rivlin | 1 | 1 |
| Sergey Brusilovsky | Adrian, Boris Nadinovitz | Grisha's Chess Buddy | 2 | 1 |
| Angel Oquendo | Thigh Patient | Eddie Ramos | 1 | 1 |
| Anne Gee Byrd | Harper | Sandra Fuller | 1 | 1 |
| Dennis Cockrum | Little League Player's Father | Steve Morris | 1 | 1 |
| Frank Clem | Turner | Mr. Wilson | 1 | 1 |
| Greta Sesheta | Mrs. Bassett | Helen | 1 | 1 |
| Rocky McMurray | Sergeant Myers | Burt Russell | 1 | 1 |
| Sam Ayers | Mike Murphy | Eddie Russ | 1 | 1 |
| Saxon Trainor | Karen Simms | Cindy Heller | 1 | 1 |
| K.T. Thangavelu | Dr. Subramanian | Judge Mary Gupta | 2 | 1 |
| Deborah Van Valkenburgh | Louise Gavin | Liz Knight | 1 | 1 |
| Elizabeth Sampson | Norma Beckwith | Sheila Lester | 1 | 1 |
| Lucy Butler | Mrs. Odachowski | Ellie Jennings | 1 | 1 |
| Nancy Youngblut | Sarah Howe | Jane Lee Rayburn | 1 | 1 |
| Robert Alan Beuth | ICU Chief | Larry Philips | 1 | 1 |
| Yolanda Snowball | Neighbor | Court Clerk | 1 | 1 |
| John Pleshette | Stuart | Judge | 1 | 1 |
| Lisa Kaminir | Jessie | Deputy D.A. Karen Paley | 1 | 1 |
| Lonnie Colon | Driver | Tony | 1 | 1 |
| Ron Bottitta | Lionel Hines-Kennedy | Grisha | 1 | 1 |
| Albert Garcia | Cop | Julio | 1 | 1 |
| Cynthia Frost | Mrs. Fruhman | Dorothy Lane | 1 | 1 |
| Eugene Alper | Boris | Andrei Kalugin | 1 | 1 |
| John C. Moskoff | Len Weston | Judge Marshall Hillstrand | 1 | 1 |
| Laura Gardner | Kennedy | Karen Russell | 1 | 1 |
| Thomas F. Duffy | Detective Henderson | Mel Wilcox | 1 | 1 |
| Ajgie Kirkland | Monty | Inventory Manager Nelson | 1 | 1 |
| Asante Jones | Workman #1 | Sgt. Gates | 1 | 1 |
| Geoffrey Rivas | Haven | Mark Robles | 1 | 1 |
| Kimleigh Smith | Ringwood | Sara Mitchell | 1 | 1 |
| Lou George | Driver | Bill Dougherty | 1 | 1 |
| Toni Torres | Lorraine | Debbie Beltran | 1 | 1 |
| Atticus Todd | Chris Sakabu | Joey Fatu | 1 | 1 |
| Carmen Mormino | Bartender | Stevens | 1 | 1 |
| Rick Zieff | How Ya Doin' Guy | Moshie | 1 | 1 |
| Reggie Jordan | Street Sweeper | Reporter #2 | 1 | 1 |
| Andy Fischer-Price | Tommy Cole | Stevie | 1 | 1 |
| David A. Kimball | tbd | Dr. Peter Weinstein | 1 | 1 |
| Kevin Sifuentes | MacGee | Ramon Cepeda | 1 | 1 |
| Craig Ricci Shaynak | Fritz | Milos | 1 | 1 |
| Garret Davis | Mr. Davis | Bailiff | 1 | 1 |
| Willow Geer | Andromeda | Laurie | 1 | 1 |
| Armando Ortega | Sheriff | Sal | 1 | 1 |
| Cooper Huckabee | Hayes | Hal | 1 | 1 |
| Frieda Jane | Petra | Mrs. Sellers | 1 | 1 |
| Kim Estes | Lieutenant Higgins | Foreman | 1 | 1 |
| Ulysses Cuadra | Jamie | Teenager #1 | 1 | 1 |
| Anthony Tavera | Rudolfo | Christopher Gonzales | 1 | 1 |
| Pamela Wilson | Patient #1 | Jury Foreperson | 1 | 1 |
| Wiley Pickett | Impaled Man | Fireman #1 | 1 | 1 |
| Amy Benedict | Mom | Amy Libergal | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.