All 105 actors in both Castle and How I Met Your Mother
105 actors have appeared in both Castle and How I Met Your Mother, across 381 episodes. The most-credited is Joe Nieves, Boyd Gamble in Castle and Carl in How I Met Your Mother.
| Actor | In Castle | In How I Met Your Mother | Eps | Eps |
|---|---|---|---|---|
| Joe Nieves | Boyd Gamble | Carl | 1 | 21 |
| Charlene Amoia | Ana Marie | Wendy | 1 | 17 |
| Michael Trucco | Detective Tom Demming | Nick Petteruti, Crush | 4 | 7 |
| Ray Wise | Bobby Fox | Robin Sr | 1 | 5 |
| K Callan | Delores Marsh | Grandma Lois | 1 | 3 |
| Laura Prepon | Natalie Rhodes | Karen | 1 | 3 |
| Valerie Azlynn | Officer Ann Hastings | Dawn | 3 | 1 |
| Dan Castellaneta | Judge Markway | Milt | 2 | 1 |
| Darby Stanchfield | Meredith | Marissa Heller | 2 | 1 |
| Abigail Spencer | Sarah Reed / Lauren Branston | BlahBlah | 1 | 1 |
| Brad Grunberg | Gary | Bruno | 1 | 1 |
| Bruce Gray | Charles Carson | Yuthers, Senior Partner | 1 | 3 |
| Erin Cahill | Cecily Burkett | Heather | 1 | 1 |
| Kathleen Rose Perkins | Elise Finnegan | Mary Beth | 1 | 1 |
| Anne Dudek | Emma Carnes | Natalie | 1 | 2 |
| Amy Gumenick | Danielle | Amanda | 1 | 1 |
| Caroline Lagerfelt | Angelica Henley | Bridal Shop Lady | 1 | 1 |
| Christine Woods | Leann West | Waitress | 1 | 1 |
| India de Beaufort | Taylor McKinley | Sophia | 1 | 1 |
| Jane Seymour | Gloria Chambers | Professor Lewis | 1 | 1 |
| Josh Wingate | Greg Page | Mike, Richard Whartonike | 1 | 2 |
| Kevin Christy | Todd / Brandon Northcliff | Sven #1 | 1 | 1 |
| Larry Poindexter | Det. McBride | Joe Donovan | 1 | 1 |
| Rebecca Budig | Mandy Bronson | Holly | 1 | 1 |
| Tom Virtue | Judge Fitz | Minister | 1 | 1 |
| Anna Zielinski | Laura Wilson | Cute Girl | 1 | 2 |
| Diane Mizota | Newscaster #2, TV Anchor | Woman | 2 | 1 |
| Elizabeth Pan | Reporter #1 | Spa Attendant | 1 | 2 |
| Paul Schackman | Barry | Dr. Mitchell Friedman | 1 | 2 |
| Angela Matemotja | Maid | Consuela | 1 | 1 |
| Carlease Burke | Storage manager | WPD Worker | 1 | 1 |
| Courtney Ford | Courtney Ford | Vicky | 1 | 1 |
| Danièle Watts | Rebecca Montgomery | Lori | 1 | 1 |
| Ella Thomas | Natasha Piper | Girl #1 | 1 | 1 |
| Erin Cardillo | Cindy Paralti | Treasure | 1 | 1 |
| Kenzo Lee | Mike Lin | Young Man | 1 | 1 |
| Lindsay Price | Lindsey Trent | Cathy | 1 | 1 |
| Morgan Peter Brown | Ted Archer | Adrian | 1 | 1 |
| Pamela Dunlap | Rose | Miss Cruickshank | 1 | 1 |
| Ping Wu | Dr. Lee | Old Man | 1 | 1 |
| Raquel Alessi | Selena Rigas | Roberta | 1 | 1 |
| Reatha Grey | Geneva | Old Lady | 1 | 1 |
| Robb Derringer | Jeffery Wadlow | Derrick | 1 | 1 |
| Scott Michael Morgan | Sam Mackey | Glen | 1 | 1 |
| Seth Green | Linus | Daryl LaCorte | 1 | 1 |
| Bruno Amato | Fred Cana | Cop | 1 | 2 |
| Aaron Hill | Kurt Wilson | The Frozen Snowshoe | 1 | 1 |
| Amir Talai | Sam Spear | Richard Greenleaf | 1 | 1 |
| Angela Martinez | Reporter | Rochelle Harper | 2 | 1 |
| Brian David Jones | State Trooper McNichols | Co-worker #2 | 1 | 1 |
| Brian Letscher | Liam Finch | Angry Guy | 1 | 1 |
| Christine Scott Bennett | Karin | Tracey | 1 | 1 |
| Emily Baldoni | Svetlana Renkov | Claudette | 1 | 1 |
| Emily Wilson | Grace Jacobs | Marshall's Stripper Daughter | 1 | 1 |
| Gattlin Griffith | Tyler Donegal | Boy | 1 | 1 |
| John Getz | Dr. Gustavo Bauer | Bob Hewitt | 1 | 1 |
| Katrina Norman | Josie Lang | Tribe Leader | 1 | 1 |
| Keisuke Hoashi | Mr. Lee | Doctor | 1 | 1 |
| Peter MacKenzie | Sgt. Roman | Mr Horvath | 1 | 1 |
| Ron Roggé | Wolkowski | Highway Cop #2 | 1 | 1 |
| Scott Allen Rinker | David Anderson | Host | 1 | 1 |
| Stephanie Faracy | Patty Schultz | Rhonda | 1 | 1 |
| Todd Sherry | Maurice | Lawrence | 1 | 1 |
| Asia De Marcos | Yoga Manager | Japanese Wife | 1 | 1 |
| Azita Ghanizada | Mistress Sapphire | Sexy Female Cop | 1 | 1 |
| Bill Parks | Tommy | Crazy Willie | 1 | 1 |
| Brea Cola | Dr. Imani Phelps | Hannah | 1 | 1 |
| Charles Rahi Chun | Paul Cho | Mr. Park | 1 | 1 |
| Erik Van Wyck | Paul Reynolds | Husband #3 | 1 | 1 |
| Joe O'Connor | Cal Townsend | Cassie's Dad | 1 | 1 |
| Matthew Rocheleau | Hans Spiffle | Stephen | 1 | 1 |
| Nick Jaine | Forensic IT Guy | Sudeep | 1 | 1 |
| Sarah Karges | Sapphire | Elaine | 1 | 1 |
| Skyler Vallo | Tatiana Fisher | Grace | 1 | 1 |
| Suzy Nakamura | Jennifer Wong | Dr. Kirby | 1 | 1 |
| Van Epperson | Postal Clerk | Shop Owner | 1 | 1 |
| Amaris Davidson | Jen | Julie | 1 | 1 |
| Karissa Vacker | Emily Reed | Holly | 1 | 1 |
| Katherine Von Till | Janice Elden | Darcy | 1 | 1 |
| Katie Silverman | Little Girl | Little Girl | 1 | 1 |
| Peter Katona | Keith Murphy | Co-worker #1 | 1 | 1 |
| Shawn Carter Peterson | Barry Bavetta | Man | 1 | 1 |
| Stephanie Lynn | Amber Middleberry | Meredith | 1 | 1 |
| Yves Bright | Tom Richwood | Patrice | 1 | 1 |
| Kyla-Drew Simmons | Sophie | Shondra | 1 | 2 |
| Adam Kulbersh | Brian Shay | Kendall | 1 | 1 |
| Cal Gibson | Chess Player | Ryan | 1 | 1 |
| Caroline Whitney Smith | Mother | Brenda | 1 | 1 |
| Guy Nardulli | Bodyguard | Vinny | 1 | 1 |
| Jackie Geary | Maggie Dowd | Jackie | 1 | 1 |
| Jeff Grace | Charlie Reynolds | Delivery Guy | 1 | 1 |
| Michael Edwin | Night Desk Clerk | Eddie | 1 | 1 |
| Roz Witt | Gladys | Mom | 1 | 1 |
| Ryan Dobson | Balthazar Wolf | Danny | 1 | 1 |
| Valorie Hubbard | Pam | Gladys | 1 | 1 |
| Herbie Jackson | Bobby Jones | Kid #2 | 1 | 1 |
| Houston Rhines | Stephen Addison | Jerry | 1 | 1 |
| Jarrod Crawford | Field Tech | Guy | 1 | 1 |
| Jeremy Glazer | Nick Keller | Bruce | 1 | 1 |
| Natalie Padilla | Alice Clark | Banana Peel Girl | 1 | 1 |
| Roger Narayan | ER Resident | Babaka | 1 | 1 |
| Shelli Boone | Chantal | bridesmaid | 1 | 1 |
| John Bobek | Davis Hawthorne | Clerk | 1 | 1 |
| Courtney Ray Geigle | Driver | Guy #1 | 1 | 1 |
| Kathleen M. Darcy | Dawn Craig | Wedding Guest #2 | 1 | 1 |
← Castle × How I Met Your Mother
Cast data from TVmaze, licensed CC BY-SA 4.0.