All 88 actors in both NCIS and The Big Bang Theory
88 actors have appeared in both NCIS and The Big Bang Theory, across 787 episodes. The most-credited is Margo Harshman, Delilah Fielding in NCIS and Alex Jensen in The Big Bang Theory.
| Actor | In NCIS | In The Big Bang Theory | Eps | Eps |
|---|---|---|---|---|
| Margo Harshman | Delilah Fielding | Alex Jensen | 21 | 4 |
| Brian George | Dr. Ameen Temani | Dr. V.M. Koothrappali | 1 | 16 |
| Brian Thomas Smith | Larry | Zack Johnson | 1 | 11 |
| Bob Newhart | Doctor Walter Magnus | Arthur Jeffries | 1 | 6 |
| Casey Sander | Ed Gantry | Mike Rostenkowski | 1 | 6 |
| Dean Norris | Vestman | Colonel Williams | 1 | 6 |
| Keith Carradine | Manheim Gold | Wyatt | 1 | 5 |
| Mark Harelik | Ron Levinson | Dr. Eric Gablehauser | 1 | 5 |
| Vernée Watson | Miss Helen Frimkes | Althea | 1 | 5 |
| Brian Patrick Wade | Marine Lance Corporal, Marine Private David Singer | Kurt | 2 | 3 |
| Swati Kapila | CEO Tamara Hamilton | Ruchi | 1 | 3 |
| Alex Ball | Navy Senior Chief Richard Granger | Waiter | 1 | 2 |
| Courtney Henggeler | Scorpio Sinn | Missy Cooper | 1 | 2 |
| Ian Reed Kesler | Mark Daniels, Police Officer Howard Shelly | Paramedic #2 | 2 | 1 |
| Jessica Walter | Judith McKnight | Mrs. Latham | 2 | 1 |
| Tania Raymonde | Anna Real, Chloe Marlene | Yvette | 2 | 1 |
| Travis Schuldt | Freddy Martin, Paul Miller | Eric | 2 | 1 |
| Angela Lin | Assistant District Attorney Sheila Addison | Maritza | 1 | 1 |
| Blake Berris | Walter Shibberd | Kevin | 1 | 1 |
| Christopher Lloyd | Joseph "Joe" Smith | Theodore | 1 | 1 |
| Erin Allin O'Reilly | Heidi Partridge | Cheryl | 2 | 2 |
| Mark Berry | Joe | Pit Boss | 1 | 1 |
| Matt Battaglia | P.O. Porcaro | Officer Reynolds | 1 | 1 |
| Annie O'Donnell | Agnes Anderstout | Mrs. Fowler, Mrs. Lorvis | 1 | 2 |
| Jim Meskimen | Doctor Farrel Emerson | Doctor, Man, Minister | 1 | 2 |
| Katie Leclerc | Marine Staff Sergeant Diana Murphy | Emily | 1 | 2 |
| Lindsey Kraft | Sarah Goode | Marissa | 2 | 2 |
| Sean Astin | Tyler Elliott | Dr. Pemberton | 1 | 3 |
| Ally Maki | Marie Manna | Joyce Kim | 1 | 1 |
| Amanda Payton | Misty Boxlarter | Ainsley | 1 | 1 |
| Craig Welzbacher | George Mansur, Motel Guest | Candidate #1 | 2 | 1 |
| Dana L. Wilson | Doctor Erica Bell | Dr. Samuels | 1 | 1 |
| Danica McKellar | Erin Kendall | Abby | 1 | 1 |
| Eric Nenninger | Navy Corpsman Taylor Henley | Neil | 1 | 1 |
| George Wyner | Randall Worthington | Dr. Zhang | 1 | 1 |
| Jeff Witzke | Attendant | Moviegoer | 2 | 1 |
| Jim Holmes | Edgar Hayes | Tim | 1 | 1 |
| Josh Banday | Harold Goodell | Nolan | 2 | 1 |
| Judith Moreland | Carrie Lewis | Jan | 1 | 1 |
| Max Adler | Luke Stana | Zombie | 1 | 1 |
| Michael Hyatt | Judy Williams | Charlotte | 1 | 1 |
| Michael Patrick McGill | Joey Kelly | Police Officer | 1 | 1 |
| Nick Clifford | Navy Petty Officer First Class Reed Haring | Phil | 1 | 1 |
| Oliver Muirhead | Jay Danorth | Professor Laughlin | 1 | 1 |
| Robert Wu | Klugman | Tam Nguyen | 1 | 1 |
| Steve Valentine | Miles Wolf | Kenneth | 1 | 1 |
| Tiffany Daniels | Navy Lieutenant Commander Renee Turner | Clerk | 1 | 1 |
| Tiffany Dupont | Kimberly Nolan | Angela | 1 | 1 |
| Todd Giebenhain | Leo Vairo | Mitch | 1 | 1 |
| Tonja Kahlens | Nina Craig | Woman | 1 | 1 |
| Treisa Gary | Hannah | Waitress | 1 | 1 |
| Troy Winbush | Former Marine 1st Lieutenant Sam Keeler | Paramedic | 1 | 1 |
| Bob Stephenson | Kevin Lane | Wendell | 1 | 1 |
| Courtney Ford | Navy Petty Officer 2nd Class Kaylen Burrows | Alice | 1 | 1 |
| David Barrera | Charlie Milla | Officer Hernandez | 1 | 1 |
| Dinora Walcott | Tour Guide | Reporter #1 | 1 | 1 |
| Eddie Shin | CGIS Special Agent Kyle Omagi | Dr. Park | 1 | 1 |
| Eileen Galindo | Evelyn Gomez | Letty | 1 | 1 |
| Eric Petersen | NCIS Forensic Accountant Dale Weems | Eric | 1 | 1 |
| Frank Alvarez | Rico | Car Thief #2 | 1 | 1 |
| Jason Kravits | Doctor Gordon Roth | Danny | 1 | 1 |
| Karl T. Wright | John Hicks | Jimmy | 1 | 1 |
| Katherine Von Till | Pamela Juventas | Tech Support Recording | 1 | 1 |
| Ken Lerner | Albert Hencheck | Dr. Schneider | 1 | 1 |
| Krishna Smitha | Dr. Carrie Moran | Woman #5 | 1 | 1 |
| Lanny Joon | Edward Jintao | Officer Shin | 1 | 1 |
| Livia Treviño | Lupe | Lourdes | 1 | 1 |
| Michael Dempsey | Coach Morgan | Security Guard | 1 | 1 |
| Peter Onorati | Chief of the Boat | Angelo | 1 | 1 |
| Phil Abrams | Hotel Manager | Dr. Bernstein | 1 | 1 |
| Rod Keller | Marty Hagen | Wardrobe Person | 1 | 1 |
| Sergio Enrique | Marine | Son | 1 | 1 |
| Seth Coltan | Deputy Allen Smedley | Earl | 1 | 1 |
| Shane Blades | Tony | Customer | 1 | 1 |
| Stephanie Escajeda | Natalia | Cindy | 1 | 1 |
| Tom Yi | Harold | Dispatcher | 1 | 1 |
| Jesse Heiman | Frederick Pippin | Bachelor Party Attendee, Comic Book Store Customer | 1 | 2 |
| Fernando Rivera | Navy Seaman Mark Forrest | Salesperson | 1 | 1 |
| Matt Knudsen | Jensen Reed | Waiter | 1 | 1 |
| Nicole J. Butler | Coordinator | Clerk | 1 | 1 |
| Rick Gifford | State Dept. Special Agent Smith | Guy | 1 | 1 |
| Will Deutsch | Smaller Guy | Jeremy | 1 | 1 |
| Briana Cuoco | Rosalind | Gretchen | 1 | 1 |
| Craig Gellis | Civilian Crewman #1 | Car Thief #1 | 1 | 1 |
| Hermie Castillo | Zeke | Colin | 1 | 1 |
| Hilda Boulware | Madam Foreperson | Woman | 1 | 1 |
| Kurt Scholler | Steve Mehlman | Judge #1 | 1 | 1 |
| Minerva García | NCIS Lawyer Taylor Hanna | Linda | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.