All 172 actors in both Castle and Numb3rs
172 actors have appeared in both Castle and Numb3rs, across 291 episodes. The most-credited is Arye Gross, Dr. Sidney Perlmutter in Castle and Professor Stanley Novich in Numb3rs.
| Actor | In Castle | In Numb3rs | Eps | Eps |
|---|---|---|---|---|
| Arye Gross | Dr. Sidney Perlmutter | Professor Stanley Novich | 17 | 1 |
| Navi Rawat | Rachel Walters | Amita Ramanujan | 1 | 7 |
| Geoff Pierson | Mr. Smith | Aaron Helm | 6 | 1 |
| Sophina Brown | Brooke Carver | Nikki Betancourt, Bianca Styles | 1 | 4 |
| Jason Beghe | Mike Royce | Reid Sarasin | 2 | 1 |
| Max Martini | Hal Lockwood | Agent Cooper | 2 | 1 |
| Bruce Davison | D.A. Lou Karnacki | Robert Oliver | 1 | 1 |
| David Clayton Rogers | Viggo Jansen | Steffen Cavani | 1 | 1 |
| Don McManus | Archie "The Savannah Hammer" Bronstein | Jeff Kinkirk | 1 | 1 |
| Eric Lange | Simon Warburg | Skipper | 1 | 1 |
| François Chau | Clifford Lee | Kaj-Jan Chen | 1 | 1 |
| Jonathan Adams | Vulcan Simmons | Clifford Hansen | 3 | 1 |
| Judith Scott | Evelyn Montgomery | Judy Turner | 3 | 1 |
| Mark Pellegrino | Tom Dempsey | Tim Hamer | 1 | 1 |
| Molly Hagan | Daisy May | Fingerprint Technician | 1 | 1 |
| Sarah Drew | Chloe Richardson | Piper St. John | 1 | 1 |
| Taylor Cole | Regina Cane | Brandi | 1 | 1 |
| Teri Polo | Kayla Baron | Rachel Willons | 1 | 1 |
| Teri Reeves | Miranda Vail | Police Tech | 1 | 1 |
| Chris Bruno | Randall Bedford | Tim King | 1 | 2 |
| Amy Hill | Alma | Property Manager | 1 | 1 |
| Andrea Roth | Nancy Underwood | Alex Trowbridge | 1 | 1 |
| Anne Dudek | Emma Carnes | Emmanueline Kirtland | 1 | 1 |
| Bill Smitrovich | Ben Davidson | David Croft | 1 | 1 |
| Caroline Lagerfelt | Angelica Henley | Rose Harris | 1 | 1 |
| Charlie Hofheimer | Eric Chambers | Ron Allen | 1 | 1 |
| Chris Coy | Zeke | Beastie Boy | 1 | 1 |
| Christina Cox | Maggie Finch | CHP Officer Morris | 1 | 1 |
| D.B. Woodside | Lance Carlberg | Jonathan Schmidt | 1 | 1 |
| Darren Pettie | Trapper John | Agent Cullen | 1 | 1 |
| Dohn Norwood | Charles Oni | Captain Hazlett | 1 | 1 |
| Erik Palladino | Coach Rome | Captain Adams | 1 | 1 |
| Ethan Phillips | Wallace Benner | Leonard Philbrick | 1 | 1 |
| George Newbern | Howard Peterson | Brendan McCrary | 1 | 1 |
| Gonzalo Menendez | Ronaldo | Victor Morelos | 1 | 1 |
| Gregg Henry | Winston Wellesley | Pete Fox | 1 | 1 |
| James Morrison | Commissioner Malone | Commander Chris Frederickson | 1 | 1 |
| Jamie McShane | Tony "The Butcher" Valtini | Paul Ballard | 1 | 1 |
| José Zúñiga | Alfredo Quintana | Bernardo Infante | 1 | 1 |
| Joy Osmanski | Liz Bell | File Clerk | 1 | 1 |
| Kelly Hu | Scarlet Jones | Alice Chen | 1 | 1 |
| Kristen Ariza | Sandra Whitman | Nurse | 1 | 1 |
| Nicole Bilderback | Joy Harrison | Tina Tran | 1 | 1 |
| Peter Onorati | Sal Malavolta | Alfred McGurn | 1 | 1 |
| Ping Wu | Dr. Lee | Steven Jintao | 1 | 1 |
| Raphael Sbarge | Dr. Darrell Meeks | Malcolm Galway | 1 | 1 |
| Reed Diamond | Dr. Cameron Talbot | Dr. Kenneth Hill | 1 | 1 |
| Stacy Edwards | Jessica Banks | Gail Hoke | 1 | 1 |
| Tom Amandes | Aaron Stokes | Lawrence Dryden | 1 | 1 |
| Yancey Arias | Carl Villante | D.J. Rodriguez | 2 | 1 |
| Bernard White | Anwar El-Masri | Frank Hagen | 2 | 1 |
| Joel Stoffer | Ron Berger | Agent Davidson, ND Agent | 1 | 2 |
| Russell Edge | Jones | Deputy Sheriff | 2 | 1 |
| Allan Louis | Capt. Frank Mahoney | John Owens | 1 | 1 |
| Andrew Leeds | Adam Murphy | Daniel | 1 | 1 |
| Andrew Rothenberg | Donald Salt | Chaney | 1 | 1 |
| Assaf Cohen | Dr. Rusham Haroun | Agent Kareem Allawi | 1 | 1 |
| Benito Martinez | FBI Special Agent Sam Walker | Arthur Ruiz | 1 | 1 |
| Catherine Dent | Beth Tanner | Naomi Vaughn | 1 | 1 |
| David Grant Wright | Ben Moss | Detective | 1 | 1 |
| Dennis Cockrum | Auctioneer | Jack Morrison | 1 | 1 |
| Derek Phillips | Reggie Walsh | Ryan Ferraro | 1 | 1 |
| Frederick Koehler | Adam Pike | Night Manager | 1 | 1 |
| Gareth Williams | Wesley Grovner | Baker | 1 | 1 |
| Jesse Head | Zack Metzger | Gregory Dietrich | 1 | 1 |
| Jim Gleason | Dr. Barry Frank | Senator Martin Tallman | 1 | 1 |
| Judith Moreland | Sandy Jenkins | Fremont | 1 | 1 |
| Kate Siegel | Nadia | Rachel Hollander | 1 | 1 |
| Melinda Page Hamilton | Diana Harris | Jennifer Nash | 1 | 1 |
| Philip Anthony-Rodriguez | Michael Grant | Marcus | 1 | 1 |
| Ray Proscia | Tom Gilliam | Condor | 1 | 1 |
| Rey Gallegos | Cesar Vales | Sonny Leyva | 1 | 1 |
| Ryun Yu | Andrew | Young Chinese Man | 1 | 1 |
| Tim Guinee | Andrew Haynes | Glen Olin | 1 | 1 |
| Tom Irwin | Simon Campbell | Dr. Stephen Atwood | 1 | 1 |
| Tymberlee Hill | Julie Taylor | FBI Tech, Junior Agent | 1 | 3 |
| Adam Wylie | Ronny | Oliver Mayo | 1 | 1 |
| Adrian LaTourelle | Rob Garrison | Allen Kelly | 1 | 1 |
| Adrian Sparks | Thaddeus Magnus | Crossing Guard | 1 | 1 |
| Alan Blumenfeld | Hank Harper | Store Owner | 1 | 1 |
| Aldis Hodge | Azi | Travis Watts | 1 | 1 |
| Andre Ing | Photographer | Shan | 1 | 1 |
| Anthony Ruivivar | Barrett Hawke | Agent Cordero | 1 | 1 |
| Bruno Campos | Calvin Creason | Randall Nespola | 1 | 1 |
| Camille Chen | Donna Brooks | Zi-Zi | 1 | 1 |
| David Burke | Chief John Brady | Jim Mazzolla | 1 | 1 |
| David DeSantos | George Reyes | Peter Guzman | 1 | 1 |
| Deborah Strang | Ruby | Martha Biggs | 1 | 1 |
| Elizabeth Pan | Reporter #1 | Agent Kim Hsaio | 1 | 1 |
| Gary Basaraba | Ralph Carbone | Joe Thibodeaux | 1 | 1 |
| Heather Mazur | Gwen Kelly | Janet Eckworth | 1 | 1 |
| Jerry O'Donnell | Milton Cicero | Pierce Brenner | 1 | 1 |
| Jonathan Silverman | Alan Masters | Kurt Young | 1 | 1 |
| Lance Reddick | Keith Kaufman | Lt. Steve Davidson | 1 | 1 |
| Laura Kai Chen | Detective Miranda Daniels | Professor Rachel Osaki | 1 | 1 |
| Mark Harelik | Pete Benton | Taylor Brindell | 1 | 1 |
| Matt Roth | Philip Dagmar | Mike Belweather | 1 | 1 |
| Meera Simhan | Cafe Hostess | Asha Rafiq | 1 | 1 |
| Andy Umberger | Johnny Rosen | Frank Auster | 1 | 1 |
| Armin Shimerman | Benjamin Donnelly | Patrick Holden | 1 | 1 |
| Brian Howe | Aaron Lerner | Robert Posdner | 1 | 1 |
| Carlos Sanz | Manuel Calderon | Detective | 1 | 1 |
| Chris Butler | Bob Foster | Cliff Howard | 1 | 1 |
| Dave Florek | Harvey | Alex Evans | 1 | 1 |
| David Barry Gray | Bert Kramer | Scott Wilson | 1 | 1 |
| Hattie Winston | Sally Niedermeyer | Eileen | 1 | 1 |
| Hector Hugo | Dr. Neville | Guard #1 (Arturo) | 1 | 1 |
| Jason Antoon | Steve Warner | Kai Kragen | 1 | 1 |
| Jason Manuel Olazábal | Detective Kurt Menendez | Jimmy Lopez | 1 | 1 |
| Jessica Lundy | Myrna Ramsey | Carolyn White | 1 | 1 |
| John Bobek | Davis Hawthorne | Punk Guy | 1 | 1 |
| Lanny Joon | Philip Lee | Colin Pang | 1 | 1 |
| Larry Clarke | Tony Muller | James Malin | 1 | 1 |
| Matt Champagne | Andy Berman | Tom Shorter AKA Carter Laidlaw | 1 | 1 |
| Patrick Bauchau | Caine Powell | Jean Stephanois | 1 | 1 |
| Ray Wise | Bobby Fox | Mitch Langford | 1 | 1 |
| Rick Ravanello | Steve Adams | Teddy Antell | 1 | 1 |
| Thomas Kopache | Abe Sandrich | Officer | 1 | 1 |
| Tom Wright | Fats Shepherd | Coach Harry Streeling | 1 | 1 |
| William Atherton | Dr. Ari Weiss | Warren Pierce | 1 | 1 |
| Sam Ayers | Bartender | FTRA Attacking Guy, News Vendor | 1 | 2 |
| Azita Ghanizada | Mistress Sapphire | Prita | 1 | 1 |
| Braeden Marcott | Pierre Dubois | Victor | 1 | 1 |
| Eltony Williams | Officer Marino | Supervising Banger | 1 | 1 |
| Hilary Ward | Bella | Audra Regal | 1 | 1 |
| Jillian Armenante | Susan Mailer | Claire Wells | 1 | 1 |
| Jon Curry | Stan Kopek | Detective | 1 | 1 |
| Nick Jaine | Forensic IT Guy | Benjamin Rajar | 1 | 1 |
| Ramona DuBarry | Reporter | Bidder | 1 | 1 |
| Scott Cohen | Lt. Stan Holliwell | James Grace | 1 | 1 |
| Jennifer Jean Snyder | Anchor, Reporter | Michelle Collins | 2 | 1 |
| Brendan Ford | Walter Voss | Phil Hadwin | 1 | 1 |
| Brett Rickaby | Robert McManus | Steve Savard | 1 | 1 |
| David A. Kimball | Mr. Kendall | Maynard | 1 | 1 |
| Gina Hecht | Marie Russo | Margaret Skinner | 1 | 1 |
| Hannah Marks | Jordan Gibbs | Libby Lamberg | 1 | 1 |
| James Martin Kelly | Robert Decker | Nevelson | 1 | 1 |
| Jeff Galfer | Henry Barnett | Bus Tech | 1 | 1 |
| Paul Cassell | Marcus Conway | Daniel Piermint | 1 | 1 |
| Will Beinbrink | Steven Fletcher | Malcolm | 1 | 1 |
| Adam J. Smith | Tom Moroni | FBI Computer Tech #3 | 1 | 1 |
| Albert Malafronte | Frank Thomas / Anatoly Arkady | Auctioneer | 1 | 1 |
| Antonio Elias | Chris Nunez | Uniform #1 | 1 | 1 |
| Arnell Powell | Chris Jackson | Security Patrol #1 | 1 | 1 |
| Benny Nieves | Domingo Verdugo | Hector Campos | 1 | 1 |
| David Figlioli | Ralph Marino | Kevin Merriman | 1 | 1 |
| Jennifer Riker | Sue Vaughn | Leah Wexford | 1 | 1 |
| John Paul Pitoc | Darius Langley | 2BY4 | 1 | 1 |
| Ken Meseroll | Man | Captain Joe MacNevish | 1 | 1 |
| Mark Berry | Captain Bigelow | Reporter #3 | 1 | 1 |
| Mark Espinoza | Professor Stevenson | Frank Lopez | 1 | 1 |
| Matt McTighe | Chuck Ryker | Armed Guard #1 | 1 | 1 |
| Michael Maize | Hank Ponzell | Wallace "Demento" Gordon | 1 | 1 |
| Tina Morasco | Janet Warner | Janette Sarasin | 1 | 1 |
| Brian Avers | Harrison Tisdale | Daniel Robertson | 1 | 1 |
| Jack Guzman | Frankie Saldana | Carlos Ruiz | 1 | 1 |
| Jeremy Glazer | Nick Keller | Clayton Caswell | 1 | 1 |
| Joe Marinelli | Jimmy Moran | Phillip Berelli | 1 | 1 |
| Kahlil Joseph | Bank Manager | Cutty Nagim | 1 | 1 |
| Kathleen Mary Carthy | Lorraine Dinovi | N.D. FBI Agent | 1 | 1 |
| Kevin Symons | Mike Matthews | CIA Officer | 1 | 1 |
| William Francis McGuire | Dan Middleberry | C.O. Lee Kettrick | 1 | 1 |
| Creagen Dow | Max Heller | Leonard | 1 | 1 |
| David Weidoff | Craig | Josh Ryan | 1 | 1 |
| George Gerdes | Michael Yanavich | Rail Cop Captain | 1 | 1 |
| Melanie Lora | FBI Technician | Margo Hughs | 1 | 1 |
| Paul Lacovara | Dr. Eric Mercer | Businessman / Cop #2 | 1 | 1 |
| Peter Katona | Keith Murphy | Marine Expert | 1 | 1 |
| Bill Tangradi | Hank | Officer Ronald Karnofsky | 1 | 1 |
| Geno Monteiro | Tyrese Wilton | LAPD Cop #1 | 1 | 1 |
| Zack Duhame | Justin Marquette | James Pinkney | 1 | 1 |
| David Parker | Duke Jone | Brennan Sommers | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.