 | Josh Radnor | ... | Ted Mosby (65 episodes, 2005-2008) |
 | Jason Segel | ... | Marshall Eriksen (65 episodes, 2005-2008) |
 | Cobie Smulders | ... | Robin Scherbatsky (65 episodes, 2005-2008) |

| Neil Patrick Harris | ... | Barney Stinson (65 episodes, 2005-2008) |

| Alyson Hannigan | ... | Lily Aldrin (65 episodes, 2005-2008) |
 | Bob Saget | ... | Older Ted Mosby / ... (51 episodes, 2005-2008) |

| Lyndsy Fonseca | ... | Daughter (25 episodes, 2005-2008) |

| David Henrie | ... | Son (25 episodes, 2005-2008) |

| Charlene Amoia | ... | Wendy / ... (11 episodes, 2005-2008) |

| Joe Nieves | ... | Carl (9 episodes, 2005-2007) |

| Ashley Williams | ... | Victoria (6 episodes, 2006) |

| Marshall Manesh | ... | Ranjit (6 episodes, 2005-2008) |

| Joe Manganiello | ... | Brad (6 episodes, 2006-2007) |

| Sarah Chalke | ... | Stella Zinman (4 episodes, 2008) |

| Matt Boren | ... | Stuart (4 episodes, 2006-2007) |

| Monique Edwards | ... | Producer (4 episodes, 2005-2007) |

| Alexis Denisof | ... | Sandy Rivers (3 episodes, 2006) |

| K Callan | ... | Grandma Lois (3 episodes, 2007) |

| Ewan Chung | ... | Office Worker / ... (3 episodes, 2006-2007) |

| Katie Walder | ... | Shannon (3 episodes, 2006-2007) |

| Meagen Fay | ... | Janice (3 episodes, 2007) |

| Ron Nicolosi | ... | Mike (3 episodes, 2006-2007) |

| Wayne Brady | ... | James (2 episodes, 2006-2007) |

| Bryan Cranston | ... | Hammond Druthers (2 episodes, 2006-2007) |

| Danica McKellar | ... | Trudy (2 episodes, 2005-2007) |

| Cristine Rose | ... | Virginia Mosby (2 episodes, 2006) |

| Britney Spears | ... | Abby (2 episodes, 2008) |
 | Bryan Callen | ... | Bilson (2 episodes, 2006-2008) |
 | David Burtka | ... | Scooter (2 episodes, 2006-2007) |

| Virginia Williams | ... | Claudia (2 episodes, 2006) |

| April Bowlby | ... | Meg (2 episodes, 2007-2008) |
 | Suzie Plakson | ... | Judy Eriksen / ... (2 episodes, 2005-2006) |

| Taran Killam | ... | Blauman (2 episodes, 2006-2008) |

| Dawn Olivieri | ... | Anna (2 episodes, 2006-2008) |

| Robert Michael Morris | ... | Vampire Lou / ... (2 episodes, 2006) |
 | Aisha Kabia | ... | Kara (2 episodes, 2006) |

| Darcy Rose Byrnes | ... | Lucy (2 episodes, 2008) |
 | Ned Rolsma | ... | Marcus Eriksen (2 episodes, 2005-2007) |

| Mark Derwin | ... | Businessman / ... (2 episodes, 2006-2007) |

| Sarah Loew | ... | Dumped Friend (2 episodes, 2005-2006) |

| Robert Michael Ryan | ... | Marvin Eriksen Jr. (2 episodes, 2005-2007) |

| Eben Ham | ... | Policeman / ... (2 episodes, 2005-2007) |
 | Frank Alvarez | ... | Steve (2 episodes, 2007) |

| Hallie Lambert | ... | Kate (2 episodes, 2008) |
 | Sharon Madden | ... | Millie (2 episodes, 2007) |

| Kathy Uyen | ... | Julia (2 episodes, 2008) |

| Katie Savoy | ... | Karen (2 episodes, 2008) |

| Tanner Maguire | ... | Young Barney (2 episodes, 2007) |
 | Michael Gross | ... | Alfred Mosby / ... (2 episodes, 2006) |
 | Michael Kagan | ... | Joel Adams (2 episodes, 2005-2008) |
 | Kelly Perine | ... | Dave / ... (2 episodes, 2006-2007) |

| Enrique Iglesias | ... | Gael (2 episodes, 2007) |
 | Nicholas Roget-King | ... | Doug (2 episodes, 2007) |
 | Stephen Keys | ... | Bouncer / ... (2 episodes, 2005-2006) |

| Maya Parish | ... | Erin (2 episodes, 2005) |
 | Napiera Groves | ... | Tanya (2 episodes, 2006) |

| Erin Cardillo | ... | Treasure (2 episodes, 2007) |
 | Rick Malambri | ... | Floppy Haired Guy / ... (2 episodes, 2006-2007) |

| Alyssa Shafer | ... | Little Girl / ... (2 episodes, 2006) |

| Patricia Place | ... | Aunt Florence (2 episodes, 2007) |

| Keisuke Hoashi | ... | Doctor (2 episodes, 2005) |

| Alyshia Ochse | ... | Tatiana (2 episodes, 2005) |

| Brian Petrucelli | ... | Moving Man / ... (2 episodes, 2005) |

| Sean Lucore | ... | Sean / ... (2 episodes, 2005) |

| Stephanie Tanner | ... | Inappropriate Wedding Guest (2 episodes, 2007) |
|
| Carter Bays | .... | executive producer (64 episodes, 2005-2008) |
| Pamela Fryman | .... | executive producer (64 episodes, 2005-2008) |
| Craig Thomas | .... | executive producer (64 episodes, 2005-2008) |
| Chris Harris | .... | producer / co-executive producer / ... (63 episodes, 2005-2008) |
| Suzy Mamann-Greenberg | .... | producer (63 episodes, 2005-2008) |
| Rob Greenberg | .... | consulting producer / executive producer (61 episodes, 2005-2008) |
| Stephen Lloyd | .... | co-executive producer / consulting producer (48 episodes, 2006-2008) |
| Stewart Halpern-Fingerhut | .... | associate producer / co-producer (47 episodes, 2005-2008) |
| Brenda Hsueh | .... | co-producer / producer (42 episodes, 2006-2008) |
| Kourtney Kang | .... | co-producer / producer (42 episodes, 2006-2008) |
| Greg Malins | .... | executive producer / consulting producer (42 episodes, 2006-2008) |
| Jamie Rhonheimer | .... | producer / supervising producer (42 episodes, 2006-2008) |
| Rob A. Fox | .... | associate producer (34 episodes, 2005-2007) |
| Kristin Newman | .... | co-executive producer (22 episodes, 2006-2007) |
| Sam Johnson | .... | consulting producer (21 episodes, 2005-2006) |
| Chris Marcil | .... | consulting producer (21 episodes, 2005-2006) |
| Jonathan Groff | .... | consulting producer (20 episodes, 2007-2008) |
| David Hemingson | .... | co-executive producer (20 episodes, 2007-2008) |
| Gloria Calderon Kellett | .... | co-producer (20 episodes, 2007-2008) |
| Phil Lord | .... | co-executive producer (17 episodes, 2005-2006) |
| Chris Miller | .... | co-executive producer (17 episodes, 2005-2006) |
| Eileen Heisler | .... | executive producer (12 episodes, 2005-2006) |
| DeAnn Heline | .... | executive producer (12 episodes, 2005-2006) |
| Missy Alexander | .... | associate producer (10 episodes, 2007-2008) |
| Ira Ungerleider | .... | co-executive producer (9 episodes, 2006) |
| Carl MacLaren | .... | associate producer: web content (8 episodes, 2007-2008) |
| Richard Choi | .... | associate producer (3 episodes, 2008) |
| |
|
| Janet Kagen | .... | script supervisor (27 episodes, 2005-2008) |
| James Jimenez | .... | production accountant (25 episodes, 2006-2008) |
| Matt Kuhn | .... | script coordinator / production staff (25 episodes, 2006-2008) |
| Craig Gerard | .... | production staff / assistant to writer (22 episodes, 2006-2008) |
| Jenni Hendriks | .... | production staff / assistant to writer / ... (22 episodes, 2006-2008) |
| Jamie Adamic | .... | assistant to producers (21 episodes, 2006-2008) |
| Amy Schwartz | .... | production staff (17 episodes, 2006-2007) |
| Adam Vine | .... | production staff (17 episodes, 2006-2007) |
| Missy Alexander | .... | production coordinator (16 episodes, 2006-2007) |
| Carl MacLaren | .... | assistant to producers (15 episodes, 2005-2007) |
| Dale Ottley | .... | assistant production accountant (15 episodes, 2005-2006) |
| Gloria Calderon Kellett | .... | executive story editor (14 episodes, 2006-2007) |
| Bryan Dych | .... | production staff (12 episodes, 2006-2007) |
| Erica Lutzjer | .... | production staff (12 episodes, 2006-2007) |
| Kelly Harris | .... | production assistant (9 episodes, 2008) |
| Dave Couture | .... | assistant to producers (8 episodes, 2007-2008) |
| Joe Kelly | .... | story editor (8 episodes, 2007-2008) |
| Todd Linden | .... | assistant to producers (8 episodes, 2007-2008) |
| Reid Watanabe | .... | production coordinator (8 episodes, 2007-2008) |
| Matthew Zinman | .... | assistant to producers (8 episodes, 2007-2008) |
| Dov Mamann | .... | production staff (8 episodes, 2008) |
| Jim Rose | .... | associate director (7 episodes, 2005-2006) |
| Daniel Esparza | .... | production staff (7 episodes, 2007-2008) |
| Kristin Rejkowski | .... | production staff (7 episodes, 2007-2008) |
| Kourtney Kang | .... | executive story editor (6 episodes, 2005-2006) |
| Marc Geller | .... | production staff (5 episodes, 2007-2008) |
| Dennis R. McElroy | .... | production staff (4 episodes, 2007-2008) |
| Brenda Hsueh | .... | story editor (3 episodes, 2005-2006) |
| Kristin Denehy | .... | choreographer (2 episodes, 2006) |
|
| Andrew Schwartz | .... | assistant: Johnson & Marcil (unknown episodes) |
| Nathan Varni | .... | production staff (unknown episodes) |
| |