All 77 actors in both It's Always Sunny in Philadelphia and NCIS: Los Angeles
77 actors have appeared in both It's Always Sunny in Philadelphia and NCIS: Los Angeles, across 510 episodes. The most-credited is Gregory Scott Cummins, Luther McDonald, Donald McDonald, Bill in It's Always Sunny in Philadelphia and Rick Pargo in NCIS: Los Angeles.
| Actor | In It's Always Sunny in Philadelphia | In NCIS: Los Angeles | Eps | Eps |
|---|---|---|---|---|
| Gregory Scott Cummins | Luther McDonald, Donald McDonald, Bill | Rick Pargo | 10 | 1 |
| Peter Jacobson | Michael Rotenberg | Special Prosecutor John Rogers | 1 | 10 |
| Jeff Kober | Creepy Guy | Harris Keane | 1 | 9 |
| Renée Felice Smith | Belle | Intelligence Analyst Penelope "Nell" Jones | 1 | 8 |
| Aisha Hinds | Welfare Case Worker | Chief Investigator Ava Wallace | 2 | 3 |
| Andrew Leeds | Jason | NCIS Tech Operator John Booker | 1 | 4 |
| Alejandro Patiño | Mr. Juarez | Day Laborer | 2 | 1 |
| Kyle Davis | Lil' Kevin | Bobby Asher | 2 | 1 |
| Kari Coleman | Margie | Jillian Rome | 1 | 1 |
| Kim Hawthorne | Susan | Dr. Diane Church | 1 | 1 |
| Mercer Boffey | Shane | Douglas Fisher | 1 | 1 |
| Regan Burns | Swim Club Manager | Brad Ross | 1 | 1 |
| Christine Horn | Cop | Elliot Reynolds | 1 | 2 |
| Marcuis Harris | Pimp (Pepper Jack) | Little Keen | 2 | 1 |
| Eddie Shin | Moderator Mike | Matthew Ogilvie | 1 | 3 |
| Audrey Wasilewski | Nurse | Meredith Huxley | 1 | 1 |
| Caitlin Carmichael | Samantha | Gia Michelle | 1 | 1 |
| Cheryl Texiera | Jane Ponderosa | Motel Manager | 2 | 1 |
| Dominic Burgess | Psycho Pete | Herman Cooper | 1 | 1 |
| Elaine Kao | Professor Lee | Xue-Li | 1 | 1 |
| Elizabeth Sung | Female Worker | Ming Lee | 1 | 1 |
| Gary Kraus | Dad | Dean | 1 | 1 |
| Gerald Downey | Bill Larkin | Marine Captain CACO | 1 | 1 |
| Ian Reed Kesler | Tim Murphy | Jeremy Pernell | 2 | 1 |
| Ken Davitian | Snyder | Narek | 1 | 1 |
| Kristin Carey | Rich Housewife | Dr. Laura Nash | 1 | 1 |
| Laura Niemi | Second Executive | CIA Analyst Wendy Balian | 1 | 1 |
| Natasha Alam | Tatiana | Veronica Pisconov | 1 | 2 |
| Rizwan Manji | Mehar | Anton Zevlos | 1 | 1 |
| Rosalie Ward | Sally | Julie King | 1 | 1 |
| Takayo Fischer | Mr. Kim | Martha Adams | 1 | 1 |
| Winston Story | Nurse | Eddie Fisk | 1 | 1 |
| Annalisa Cochrane | Birthday Girl | Emily Conway | 1 | 1 |
| Elaine Loh | Attorney's Secretary | LAPD Officer Lisa Chan | 1 | 1 |
| Jeremy Denzlinger | Police Officer | DOD Guard | 1 | 1 |
| Joe Thornton, Jr. | Lester Barrett | LAPD Officer Glen Northam | 1 | 3 |
| Jose Yenque | Ernesto | Navy Captain Carlos Fuentes | 1 | 1 |
| Khaneshia "KJ" Smith | Sequoia | Chelsea Parker | 1 | 1 |
| Oscar Nuñez | Sudz Manager | Lionel Fernandez | 1 | 1 |
| Patrick Gorman | Homeless Man | Hans Schreiber | 1 | 1 |
| Peter Asle Holden | Union Delegate | Benjamin Strauss | 1 | 1 |
| Spencer Daniels | Tommy | Navy Petty Officer 2nd Class Vincent Davis | 1 | 1 |
| Stephen Marcus | Nearby Patron | Andy Green | 1 | 1 |
| Antonio D. Charity | Picketer #2 | W&P Worker | 1 | 1 |
| Barry Livingston | Third Executive | Chief Surgeon Dr. John Bates | 1 | 1 |
| Casey Sander | Group Leader | Ray Turner | 1 | 1 |
| Hal Devi | Security Guard | Angry Guest | 1 | 1 |
| Jay Harik | Gas Station Owner | Manager | 1 | 1 |
| Marc Anthony Samuel | Raisin #1 | Navy Lieutenant Commander George Owens | 1 | 1 |
| Maria Zyrianova | Dusty | Ms. Surnin | 1 | 1 |
| Paloma Esparza Rabinov | Britney | Katie | 1 | 1 |
| Phil Abrams | Doctor | Ben Walker | 1 | 1 |
| Steve Tom | Jameson Taft | Roger/Morgan | 1 | 1 |
| Adam J. Harrington | Gym Manager | Robert Bryant | 1 | 1 |
| Anthony Hill | Black Mac | Waiter / Jason | 1 | 1 |
| Derek Basco | Store Manager | Hank Tam | 1 | 1 |
| Dior Allen | Jim (EMT Instructor) | Man | 1 | 1 |
| Erik Jensen | Walter Harris | FBI Agent Landon Frisbee | 1 | 1 |
| Gerald Webb | Another Detective | Vertadyne Driver | 1 | 1 |
| Jason Manuel Olazábal | Worker | Craig Lennox | 1 | 1 |
| Lauren McKnight | Anna | Coco | 1 | 1 |
| Miles Anderson | Father Michael | Brian Cooper | 1 | 1 |
| Pam Trotter | Backup Singer #1 | Loretta Dawson | 1 | 1 |
| Robert Craighead | Gabe | Homeless Man | 1 | 1 |
| Theo Breaux | Louis Barrett | Boyle | 1 | 1 |
| Tom Virtue | Rink Official | Dr. Hodge | 1 | 1 |
| Wayne Federman | Mr. Sanderson | Eli | 1 | 1 |
| Denell Johnson | Police Officer | Barista | 1 | 1 |
| Devan Long | Gym Worker | Henchman | 1 | 1 |
| Matthew Jones | Customer #1 | Cop | 1 | 1 |
| Nikki McKenzie | Keisha | Dealer | 1 | 1 |
| Patrick Hume | Edgar | Willy | 1 | 1 |
| Treisa Gary | Teacher | Judge | 1 | 1 |
| Gichi Gamba | Boko Haram Leader | FBI Bomb Tech #1 | 1 | 1 |
| Amy Holland Pennell | Vanessa | Lara Winston | 1 | 1 |
| Andrew Thacher | Detective | FBI Swat Commander | 1 | 1 |
| Meredith Giangrande | Nancy | Young Tan Woman | 1 | 1 |
← It's Always Sunny in Philadelphia × NCIS: Los Angeles
Cast data from TVmaze, licensed CC BY-SA 4.0.