All 130 actors in both Ally McBeal and NCIS
130 actors have appeared in both Ally McBeal and NCIS, across 620 episodes. The most-credited is Taye Diggs, Jackson Duper in Ally McBeal and Marine Gunnery Sergeant Aaron Davis in NCIS.
| Actor | In Ally McBeal | In NCIS | Eps | Eps |
|---|---|---|---|---|
| Taye Diggs | Jackson Duper | Marine Gunnery Sergeant Aaron Davis | 10 | 1 |
| Gerry Becker | Attorney Myron Stone | William Baer | 8 | 1 |
| Melinda McGraw | Nancy Gower | Diane Sterling | 1 | 6 |
| Paula Newsome | Phyllis Butters | Jackie Vance | 1 | 4 |
| Tony Gonzalez | Juror | NCIS Special Agent Tony Francis | 1 | 4 |
| Alexandra Holden | Jane Wilco | Brooke Fenten | 3 | 1 |
| Brigid Brannagh | Paula | Senator Constance Miller, Catherine Reynolds | 1 | 3 |
| Larry Brandenburg | Judge Raynsford Hopkins | Hubble | 3 | 1 |
| Linda Gehringer | Attorney General Janet Reno, Shirley Peterson | Michelle Stark | 3 | 1 |
| Victoria Kelleher | Helen Fischer | NCIS Accountant Barbara Dunsley | 1 | 3 |
| Anne-Marie Johnson | D.A. Foster | Marine Col. Stacey Radcliffe, Senator Selena Grayson | 1 | 2 |
| Dina Meyer | Anna Flint | Holly Snow | 1 | 2 |
| Kelli Williams | Lindsay Dole | NCIS Special Agent Maureen Cabot | 1 | 2 |
| Roma Maffia | Attorney Beckerwith | NCIS Special Agent Vera Strickland | 1 | 2 |
| Alicia Coppola | Holly Richardson | Faith Coleman | 2 | 3 |
| Wendy Worthington | Margaret Camaro | Gila Shaw | 4 | 1 |
| Christian Clemenson | Mr. Hookland | Perry Sterling | 1 | 1 |
| Dee Wallace | Gail Clarkson | Claire Hall | 1 | 1 |
| James Eckhouse | Attorney | Fred Cabrisio | 1 | 1 |
| Michael O'Neill | Dr. Colbert | Former NCIS Special Agent Riley McCallister | 1 | 3 |
| Michael Weatherly | Wayne Keebler | Special Agent Anthony "Tony" DiNozzo | 1 | 1 |
| Raphael Sbarge | Attorney Burlingham | Rupert Kritzer | 1 | 1 |
| Richard Riehle | Jack Billings | Walt Osorio | 2 | 2 |
| Tim DeKay | Kendall Willis | Senator Patrick Kiley | 1 | 1 |
| William R. Moses | Kenneth Thompson | Edison Geary | 1 | 1 |
| Aloma Wright | Judge Aloma Harris | Nurse Ethel Washingtown | 2 | 1 |
| French Stewart | Michael Walker | Paul Triff | 1 | 2 |
| Lauren Bowles | Callie Horne | Mary Wiles, Nance Freeman | 1 | 2 |
| Steven Culp | Attorney Dixon | Navy Cmdr. William Skinner | 2 | 1 |
| Tracy Middendorf | Risa Helms | Tara Bick | 2 | 1 |
| Bruce French | Simon McAllister | Floyd Vernon | 3 | 1 |
| Richard Schiff | Bernie Gilson | Harper Dearing | 1 | 3 |
| Brooks Almy | Principal Stiles | Mrs. McDonald | 1 | 1 |
| Clyde Kusatsu | Dr. Myron Okubo | Benjamin Franklin, Mister Takumi Rin | 2 | 2 |
| Jennifer Rhodes | Gladys Claven | Claudia | 1 | 1 |
| Kate McNeil | Marianne Harper | Commander Green | 1 | 1 |
| Sam Anderson | Mark Harrison | Walter Carmichael | 1 | 1 |
| Steve Harris | Eugene Young | Gerald Tanner | 1 | 1 |
| William Russ | Michael Bassett | Philip Wickes | 2 | 1 |
| Wilson Cruz | Stephanie Grant | Todd Ryder | 1 | 1 |
| Bruce Nozick | Attorney | Harvey Grossman, Lacy | 2 | 2 |
| Jonathan Redford | Geekhead #3 | Corpsman Timothy Morgan | 3 | 1 |
| Brett Cullen | Prof. James Dawson | Navy Capt. Todd Gelfand | 1 | 2 |
| Holmes Osborne | Det. Gerard Billow, Principal Figgins | Fred Hanlan | 2 | 1 |
| Robert Catrini | Frankie Turbo | General Floyd Brancato, Jake Ford | 1 | 2 |
| Robert Clendenin | Benjamin Winter | Pharmacist | 2 | 1 |
| Antonio Sabàto Jr. | Kevin Wyatt | Dale Kapp | 1 | 1 |
| Chet Grissom | Driver | Rupert Kittridge | 1 | 1 |
| Cleo King | Ms. Parks | Della Robinson | 1 | 1 |
| Conor O'Farrell | Attorney Jordan | William Danforth | 1 | 1 |
| Cristine Rose | Marci Hatfield | Pat Stone | 1 | 1 |
| David Burke | Harry | George Ingram | 1 | 1 |
| Frederick Koehler | Marcus | Simon Gravy | 1 | 1 |
| Joel Brooks | Dr. Hubbell | Ronnie Mustard | 1 | 1 |
| Judith Moreland | D.A. Sharon Anderson | Carrie Lewis | 1 | 1 |
| Marguerite MacIntyre | Deborah Schofield | Commander Lauren Tyler | 1 | 1 |
| Michael Hyatt | Stage Manager | Judy Williams | 1 | 1 |
| Michael Reilly Burke | Mr. Wells | Frank Connell | 1 | 1 |
| Peter MacKenzie | Kendall Stevens | Jack Murdoch | 1 | 1 |
| Thomas Crawford | Foreperson | Doctor Walter Magnus | 1 | 1 |
| Clare Carey | Mary Clapp | Ann Gibbs | 1 | 2 |
| Debra Christofferson | Vicky Sharpe | Rita Gregg, Uta | 1 | 2 |
| Jeremy Garrett | Tim Boyle | Marine Capt. Patrick Barnett | 2 | 1 |
| Michael Gaston | Mark Horace | Maj. Dougherty | 2 | 1 |
| Alex Hyde-White | TBA | Dr. Adam Tallridge | 1 | 1 |
| Bob Stephenson | Peter | Kevin Lane | 1 | 1 |
| Dan Martin | Principal Jolie | Mail Carrier | 1 | 1 |
| Graham Beckel | Mr. Feldman | Norman "Pit" Pittorino | 1 | 1 |
| Gregg Daniel | Doctor | Parking Enforcement Officer Riggs | 1 | 1 |
| Jesse D. Goins | Det. Chouinard | Jeffrey Wilson | 1 | 1 |
| Joe Regalbuto | Harvey Hall | Marine Colonel George Ellis | 1 | 1 |
| Ken Lerner | Attorney Dick Raditz | Albert Hencheck | 1 | 1 |
| Kirsten Nelson | Connie Dekumbis | Beth Banks | 1 | 1 |
| Lawrence Pressman | Judge Harland Smart | Dr. Russell Pike, Secret Service Director | 1 | 2 |
| Mark L. Taylor | Joel Schofield | Dr. Harvey Kimball | 1 | 1 |
| Michael A. Shepperd | Dr. Liston | Mailman, NCIS Custodian Louis | 1 | 2 |
| Randy Oglesby | Harvey Kent | Army Brigadier General Scott Oliver | 1 | 1 |
| Robert Blanche | Officer | Brett Willis | 1 | 1 |
| Robert Costanzo | George Chisholm | Jimmy Napalitano | 1 | 1 |
| Stan Ivar | Jason Hatfield | Former NCIS Special Agent Ben Robinson | 1 | 2 |
| Tom Virtue | Ally's Father | Frank Satner | 1 | 1 |
| Andy Umberger | Mr. Fordham | FBI Agent Freedman | 1 | 1 |
| Audrey Wasilewski | Maureen Ringer | Shirley Wilkes | 1 | 1 |
| Carol Locatell | Judge Henrietta Fullem | Renee Prewdome | 1 | 1 |
| Christine Dunford | Eva Curry | Jeri Fleckman | 1 | 1 |
| Darin Cooper | Pedestrian | Roy Evans | 1 | 1 |
| Don McManus | Greg Harrod | Mark Stafford | 1 | 1 |
| Geoffrey Wade | Dr. Kipperman | Air Force Brigadier General Jack Mandrake | 1 | 1 |
| Joel Polis | Attorney Woodson | Ronald Ostrowski | 1 | 1 |
| John Thaddeus | Michael Young | Lane Danielson | 1 | 1 |
| Matt Malloy | Dr. Spickett | George Pardo | 1 | 1 |
| Natalija Nogulich | Melissa Bloom | Judge Maddox | 1 | 1 |
| Robert Picardo | Barry Philbrick | Retired Marine Gunnery Sergeant Dale Harding | 1 | 1 |
| Sara Botsford | Attorney Post | Dr. Helen Berkley | 1 | 1 |
| Shirley Jordan | Nancy Sosha | Mary Tyler | 1 | 1 |
| Stephen O'Mahoney | Clerk | CEO Paul Newhope | 1 | 1 |
| Steven Flynn | Sam Little | Roman Sobchek | 1 | 1 |
| Aaron Lustig | Attorney Bowe | Doctor Victor Kalsa | 1 | 1 |
| Barry Livingston | Dr. John Emburg | Bartholomew Lemming | 1 | 1 |
| Bradley White | Mr. Mackey | Bart Powell | 1 | 1 |
| Eyal Podell | Attorney Whoople | Namir Eschel | 1 | 1 |
| Helen Eigenberg | A.D.A. Kettering | Lt. Cmdr. Amanda Wilkerson | 1 | 1 |
| Missy Yager | Molly | Michelle Davison | 1 | 1 |
| Robert Curtis Brown | Attorney McCabe | Gary Tolin | 1 | 1 |
| Sarah Hagan | Girlfriend #3 | Sandy | 1 | 1 |
| Tom Kemp | Foreman | Assistant Secretary of ICE Len Gregory | 1 | 1 |
| Victor McCay | Gilbert Breen | Ash | 1 | 1 |
| Adrian Sparks | Katz | Hugo Radcliffe | 1 | 1 |
| David Batiste | Michael Pupnick | Max Phillips | 1 | 1 |
| Derek Anthony | Clerk | NCIS Maintenance Worker Lennox Kincaid | 1 | 1 |
| Greta Sesheta | Foreperson | Receptionist | 1 | 1 |
| John O'Brien | Waiter | Bruce | 1 | 1 |
| Mary-Margaret Lewis | Foreperson | Maude Simmons | 1 | 1 |
| Peter Birkenhead | Steve | Elroy Webster | 1 | 1 |
| Scott Klace | Dr. Hobey | Dr. Timothy Hass | 1 | 1 |
| Terry Rhoads | Mr. Furnwall | Stanley Borden | 1 | 1 |
| Brody Hutzler | Chris Melnick | Navy Lieutenant Michael Jensen | 1 | 1 |
| Elena Lyons | Nicole | Diane Fontaine | 1 | 1 |
| Kendall Clement | Officer | Foreman | 1 | 1 |
| Mark Ankeny | Foreman | Barry Kester | 1 | 1 |
| Mary Wickliffe | Ms. Findley | Nurse Dooley | 1 | 1 |
| Paul Perri | Attorney Serrano | Man | 1 | 1 |
| Ty Upshaw | Detective | Security Guard | 1 | 1 |
| Warren Sweeney | Ken Falco | Priest | 1 | 1 |
| H. Richard Greene | Judge Paul Stewart | Thomas Victor | 1 | 1 |
| Harvey J. Alperin | Foreman | Henry Mantell | 1 | 1 |
| Edward Conna | Coroner's Assistant | Metro Police Srgt. Frank Thompson | 1 | 1 |
| Felice Heather Monteith | Singing Lawyer | FBI Agent Samantha Morris | 1 | 1 |
| Judith Drake | Foreperson | Delores | 1 | 1 |
| Brad Grunberg | Emcee | Big Ed | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.