All 160 actors in both Castle and Monk
160 actors have appeared in both Castle and Monk, across 297 episodes. The most-credited is Geoff Pierson, Mr. Smith in Castle and Harry Bolston in Monk.
| Actor | In Castle | In Monk | Eps | Eps |
|---|---|---|---|---|
| Geoff Pierson | Mr. Smith | Harry Bolston | 6 | 1 |
| Josh Stamberg | Martin Danberg | Agent Grooms | 2 | 2 |
| Dan Castellaneta | Judge Markway | Tiny Werner | 2 | 1 |
| Darby Stanchfield | Meredith | Erin Hammond | 2 | 1 |
| James Brolin | Jackson Hunt | Daniel Thorn | 2 | 1 |
| Ricardo Antonio Chavira | Congressman Alex Lopez | Jimmy Belmont | 1 | 2 |
| Alicia Coppola | Amber Patinelli | Michelle Rivas | 1 | 1 |
| Brett Cullen | Christian Dahl | James | 1 | 1 |
| Brianna Brown | Eva Whitfield | Joanne | 1 | 1 |
| Christina Vidal | Jamie Ruiz | Winona | 1 | 1 |
| Currie Graham | Stanford Raynes | Harold Maloney | 1 | 1 |
| Joelle Carter | Maggie Ingram | Barbara O'Keefe | 1 | 1 |
| Judith Scott | Evelyn Montgomery | Principal Franklin | 3 | 1 |
| Lola Glaudini | Marilyn Sutton | Ariana Dakkar | 1 | 1 |
| Molly Hagan | Daisy May | Ms. Lennington | 1 | 1 |
| Rosalind Chao | Mimi Tan | Arleen Cassidy | 1 | 1 |
| Tony Plana | Father Aguello | Captain Alameda | 1 | 1 |
| Wallace Langham | Dr. Van Holtzman | Steve DeWitt | 1 | 1 |
| D.B. Woodside | Lance Carlberg | Dr. Matthew Shuler | 1 | 2 |
| Amy Aquino | Janine Marks | Mrs. Bowen, Rhonda | 1 | 2 |
| Bre Blair | Toni Johnston | Debbie Barnett | 1 | 1 |
| Chet Grissom | Agent Gray | Detective #1, Detective Burns, Detective Terry Chasen | 1 | 3 |
| Chris Coy | Zeke | Second Slacker | 1 | 1 |
| Christopher Cousins | Nolan Burns | Lt. Hendrix | 1 | 1 |
| Daniel Roebuck | Joe Silva | Larry Zwibell | 1 | 1 |
| Dina Meyer | Lady Irena | Sally Larkin | 1 | 1 |
| Drew Powell | Sam Carson | Eddie Murdoch | 1 | 1 |
| Eddie McClintock | Rogan O'Leary | Warren Kemp | 1 | 1 |
| Gail O'Grady | Margo Gower | Lovely Rita, Miranda St. Claire | 1 | 2 |
| Jack Wagner | Billy Piper | Perry Walsh | 1 | 1 |
| Jamie McShane | Tony "The Butcher" Valtini | Iverson | 1 | 1 |
| Jim Hoffmaster | Clerk | Vendor | 1 | 1 |
| John Kapelos | Joe Pulgatti | Pauly Flores | 1 | 1 |
| Keith Robinson | Random Pierce | Officer Darden, Traffic Cop | 1 | 2 |
| Kevin Kilner | Jamie Berman | Jack Bollinger | 1 | 1 |
| Krista Allen | Naomi Duvray | Teresa Telenko | 1 | 1 |
| Lochlyn Munro | Kevin McCann | Tony Lucarelli | 1 | 1 |
| Patrick Fischler | Leo | Eddie | 1 | 1 |
| Peter James Smith | Agent Richmond | Agent Keao | 2 | 1 |
| Peter Onorati | Sal Malavolta | Archie Modine | 1 | 1 |
| Reed Diamond | Dr. Cameron Talbot | Agent Stone | 1 | 1 |
| Rose Abdoo | Dr. Cynthia Swann | Mrs. Monk | 1 | 1 |
| Sarah Brown | Amanda Livingston | Mandy Bronson | 1 | 1 |
| Teri Polo | Kayla Baron | Stephanie Briggs | 1 | 1 |
| Tom Virtue | Judge Fitz | Benjy's coach | 1 | 1 |
| Kathleen Mary Carthy | Lorraine Dinovi | CSI Technician Macy, Field Tech, Medical Examiner | 1 | 3 |
| Sean Blodgett | Avery Zussman | Coroner, CSI Tech, Dr. Z | 1 | 3 |
| Gregg Daniel | Walt Shaw | Chuckling Detective, Truck Driver | 1 | 2 |
| Adam Kulbersh | Brian Shay | Dr. Edward Garcia | 1 | 1 |
| Andrew Rothenberg | Donald Salt | Medical Examiner | 1 | 1 |
| Benito Martinez | FBI Special Agent Sam Walker | Ex-Marine | 1 | 1 |
| Brynn Thayer | Penelope Keller | Aunt Cokie | 1 | 1 |
| Chandra West | Maggie Vega | Carolyn Walsh | 1 | 1 |
| Clare Carey | Noreen Hixton | Sister Heather | 1 | 1 |
| Courtney Ford | Courtney Ford | Emily Carter | 1 | 1 |
| David Eigenberg | Peter Connelly | Tim Hayden | 1 | 1 |
| Erin Cahill | Cecily Burkett | Callie Esterhaus | 1 | 1 |
| Ethan Erickson | Xander Doyle | David Gitelson | 1 | 1 |
| Glenn Morshower | Defense Secretary Michael Reed | Martin Willowby | 1 | 1 |
| Graham Beckel | Ted Murphy | Bill Gibbard | 1 | 1 |
| Gregory Alan Williams | Jim Van-Eps | Sorenson | 1 | 1 |
| Jack McGee | Dale Fickas | Sgt. Danny Weaver | 1 | 1 |
| Jennifer Hall | Rebecca Strong | Abby | 1 | 1 |
| Jim O'Heir | Hal Rossi | Park Ranger | 1 | 1 |
| John Hemphill | Tom Walters | Eric Gilbertsen | 1 | 1 |
| John Mese | Mr. Charles Beaumont | Ringel | 1 | 1 |
| Jon Polito | Harold Leone | George Gionopolis | 1 | 1 |
| Kathe Mazur | Anya Mishkin | Diana Phelps | 1 | 1 |
| Kelly Carlson | Ellie Monroe | Lola | 1 | 1 |
| Lex Medlin | Seth Parrino | Richard Meckler | 1 | 1 |
| Mark Sivertsen | Jeff Powers | Sean | 1 | 1 |
| Patrick St. Esprit | Special Agent Emmett Forrest | Lody | 1 | 1 |
| Paul Ben-Victor | Dino Scarpella | Al Nicoletto | 1 | 1 |
| Rebecca Field | Marilyn Kane | Gail | 1 | 1 |
| Rick Ravanello | Steve Adams | Detective | 1 | 1 |
| Ron Roggé | Wolkowski | Welder | 1 | 1 |
| Sonya Eddy | Olivia 'Mama' Toussaint | Opal | 1 | 1 |
| Wings Hauser | "Lucky" Jack Flanagan | Mr. Cobb | 1 | 1 |
| Billy Mayo | Senior Officer | Mechanic | 2 | 1 |
| Burnadean Jones | Tech #2 | Toddler's Mom | 2 | 1 |
| Barry Livingston | Abe | Geiger Counter Enthusiast | 1 | 1 |
| Carlos Gómez | Captain Fowler | Escobar | 1 | 1 |
| Charles Rahi Chun | Paul Cho | Simon | 1 | 1 |
| Christopher Goodman | man #1 | CSI Tech, Young Uniform Cop | 1 | 2 |
| David Meunier | Sasha | Ray Kaspo | 1 | 1 |
| Hector Luis Bustamante | William "Billy" Hicks | Gomez | 1 | 1 |
| James C. Victor | Johnny Dimes | Limo Driver | 1 | 1 |
| Jim Piddock | Lord Henry | Jake the Drifter | 1 | 1 |
| Karl T. Wright | Dr. Chuck Vaughn | Monk's Lawyer, Principal Thicket | 1 | 2 |
| Mark Harelik | Pete Benton | Mikel Alvanov | 1 | 1 |
| Matt Winston | Evan Hinkle | Brian Babbage | 1 | 1 |
| Patrick O'Connor | Chris Markum | Daniel MacGraw | 1 | 1 |
| Rey Gallegos | Cesar Vales | Eddie Dial | 1 | 1 |
| Adam Wylie | Ronny | Pet Store Clerk | 1 | 1 |
| Andrea Bogart | Callie Langston | Actor Playing Disher | 1 | 1 |
| Andrew Borba | Mr. Mudge | Parole Commissioner | 1 | 1 |
| Anne Marie Howard | Angela Russo | Newswoman | 1 | 1 |
| Brad Grunberg | Gary | Augie Wellman | 1 | 1 |
| Brennan Elliott | Jason Cosway | Paul Harley | 1 | 1 |
| Brian McNamara | Mike Sampson | Kyle Brooks | 1 | 1 |
| Bruno Amato | Fred Cana | Crew Member | 1 | 1 |
| Denise Dowse | Judge Gloria Wollcott | Samantha Austin | 1 | 1 |
| Ethan Cohn | Milo Pavlik | Kyle Larkin | 1 | 1 |
| Jeris Lee Poindexter | Older Man | Eddie | 1 | 1 |
| Keisuke Hoashi | Mr. Lee | First Cop | 1 | 1 |
| Matt Champagne | Andy Berman | Steve Marriott | 1 | 1 |
| Ryan Alosio | Mike Weitz | Warren | 1 | 1 |
| Samantha Quan | Kathleen Park | Female Control Officer | 1 | 1 |
| Scott Michael Morgan | Sam Mackey | Security Guard | 1 | 1 |
| Susan Ruttan | Eleanor Pike | Mrs. Ledsky | 1 | 1 |
| William Atherton | Dr. Ari Weiss | Commander Whitaker | 1 | 1 |
| Bonita Friedericy | Sister Mary | Housewife Juror | 1 | 1 |
| Dale Waddington Horowitz | Kelly Gunther | Mrs. Hammond | 1 | 1 |
| Devon Gummersall | Matt Haley | Phil Bedard | 1 | 1 |
| Elena Evangelo | Jennifer Perez | Linda Kloster | 1 | 1 |
| Gattlin Griffith | Tyler Donegal | Matthew | 1 | 1 |
| Guy Nardulli | Bodyguard | Uniform Cop | 1 | 1 |
| Jessica Lundy | Myrna Ramsey | Rachel Sweeney | 1 | 1 |
| Rob Brownstein | Captain Ziering | Cory | 1 | 1 |
| Ronnie Steadman | Gabriel Shaw | First Cop | 1 | 1 |
| Tim De Zarn | Bartender | Max Barton | 1 | 1 |
| Todd Waring | Doug Ellers | Maintenance Worker | 1 | 1 |
| Cantrell Harris | Officer Ellroy | Father | 1 | 1 |
| Chase Kim | FBI Specialist | Thai Drug Lord | 1 | 1 |
| Christie Lynn Smith | Melanie Kopek | Valerie | 1 | 1 |
| Christina Ferraro | Sarah Vasquez | Miranda | 1 | 1 |
| David Figlioli | Ralph Marino | Tommy Zimm | 1 | 1 |
| Ivo Nandi | Teodor Hajek | Honest Ramone | 1 | 1 |
| James Martin Kelly | Robert Decker | Fire Marshall | 1 | 1 |
| Jeffrey Vincent Parise | Tommy Moretti | Dustin | 1 | 1 |
| Jeremy Forte | Security Guard | Father | 1 | 1 |
| John Bobek | Davis Hawthorne | Brother Zack | 1 | 1 |
| Kendall Clement | Judge | Warehouse Judge | 1 | 1 |
| Kincaid Walker | Marilyn Singer | Jean Garnett | 1 | 1 |
| Lou George | Charlie Blunt | Maitre'd | 1 | 1 |
| Michael Edwin | Night Desk Clerk | Barber | 1 | 1 |
| Rey Herrera | Mario Guerrera | Newscaster | 1 | 1 |
| Ruth Williamson | Geraldine Powers | Doris | 1 | 1 |
| Christopher May | Arthur Sansone | Second Attendant | 1 | 1 |
| Endre Hules | Pavel Oborin | Captain Dupres | 1 | 1 |
| Jennifer Riker | Sue Vaughn | Business Woman | 1 | 1 |
| Jerry Kernion | Albert Bolland | Security Guard | 1 | 1 |
| Pamela Shaddock | Marcella | Waitress | 1 | 1 |
| Albert Malafronte | Frank Thomas / Anatoly Arkady | Congressman | 1 | 1 |
| Andrew Elvis Miller | Jake Cunio | Undercover Agent #2 | 1 | 1 |
| Assaf Cohen | Dr. Rusham Haroun | Ricardo | 1 | 1 |
| Carlease Burke | Storage manager | Teacher Juror | 1 | 1 |
| Chad E. Donella | Troy Strickland | Ricky Babbage | 1 | 1 |
| David Weisenberg | Lawyer | Paul Gilstrap | 1 | 1 |
| Frank Gallegos | Keith Lopez | Chief Mechanic | 1 | 1 |
| Larry Clarke | Tony Muller | Rudy | 1 | 1 |
| Michael Dempsey | Frank Malloy | Detective Patterson | 1 | 1 |
| Roz Witt | Gladys | Lunch Lady | 1 | 1 |
| Van Epperson | Postal Clerk | Postal Worker Juror | 1 | 1 |
| Dmitri Boudrine | Ilya | Ambassador of Latvia | 1 | 1 |
| Nick Hoffa | Staff Sgt. Cass | Bartender | 1 | 1 |
| David A. Kimball | Mr. Kendall | Minister | 1 | 1 |
| Elena Caruso | Dancer | Entering Customer | 1 | 1 |
| Kathleen M. Darcy | Dawn Craig | Mrs. Esterbrook | 1 | 1 |
| Mark Bloom | Neal Morris | CSI Tech | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.