All 51 actors in both L.A. Law and Three's Company
51 actors have appeared in both L.A. Law and Three's Company, across 341 episodes. The most-credited is Jordan Charney, Dr. Samuel Adelson, Judge Joseph Gennis in L.A. Law and Frank Angelino, Mr. Layton in Three's Company.
| Actor | In L.A. Law | In Three's Company | Eps | Eps |
|---|---|---|---|---|
| Jordan Charney | Dr. Samuel Adelson, Judge Joseph Gennis | Frank Angelino, Mr. Layton | 2 | 12 |
| Richard Kline | Pembrook | Larry Dallas | 1 | 12 |
| Don Sparks | Russell Spitzer | Bob, Francis Kirk | 8 | 2 |
| Earl Boen | Judge Walter L. Swanson | Reverend Gilmore | 8 | 1 |
| Cynthia Harris | Iris Hubbard | Mrs. Layton | 7 | 1 |
| Jeffrey Tambor | Gordon Salt | Dr. Phil Greene, Dr. Tom Miller, Winston Cromwell III | 3 | 3 |
| Joe George | Judge Hogan Mueller | Chauffeur, Crook, The Waiter | 2 | 3 |
| Karen Austin | Hillary Mishkin | Denise, Jennifer | 3 | 2 |
| Stanley Kamel | Mark Gilliam | Clean Cut Man | 4 | 1 |
| Joel Brooks | Don Butcher, Kiefer Mitchell | Dr. Prescott | 2 | 2 |
| Barbara Stuart | Marion Laraby | Martha, Mrs. Medford | 1 | 2 |
| John McCook | Barry Graham | Alan, Doug Cooper | 1 | 2 |
| Parley Baer | Judge Parker | Bert Landers | 2 | 1 |
| Rod McCary | Herb DiGrassi | Bill Martin, Gregg Halliday | 1 | 2 |
| Macon McCalman | Judge Whitney Baldwin | Roland Wood, Mr. Penrose | 2 | 3 |
| Robyn Peterson | Marilyn Hopkins | Tammy | 4 | 1 |
| Britt Leach | Walt Brown | Chuck, Frank, the Bartender, The Husband | 1 | 3 |
| Dennis Robertson | Carlton Gertz | Detective | 1 | 1 |
| Gary Grubbs | U.S. Marshal William Hopson | Harry | 1 | 1 |
| George O. Petrie | Dwight Kroft | Mr. Williams | 1 | 1 |
| James Cromwell | Attorney Hutton | Detective Lannigan | 1 | 1 |
| Jeannetta Arnette | Vicki Simonetti | Detective Green | 1 | 1 |
| John Fiedler | Francis Pencava | Morris Morris | 1 | 1 |
| Judy Kain | Joanna | Joan Ferguson | 1 | 1 |
| Tom Lacy | Gene Strouse | Mr. Wagstaff | 1 | 1 |
| Barry Gordon | Seth Shumay | Gilbert Larwin | 2 | 1 |
| Irene Tedrow | Katherine Crutcher | Martha, Miss Arlington | 1 | 2 |
| Thomas Ryan | Sid Hershberg, Larry Ruland | Bernie | 4 | 1 |
| Alan Koss | Kevin Riley | Ralph | 1 | 1 |
| Bob Tzudiker | Gordon Stern | Mr. Jones | 1 | 1 |
| Brian Byers | David Boyer | Tom Ferguson | 1 | 1 |
| Dick O'Neill | Father Walter McNamara | Walter Nessle | 1 | 1 |
| Dick Sargent | Edmund Bates | Lloyd Cross | 1 | 1 |
| Frank Schuller | Judge Cyril Hodges | Police Officer | 1 | 1 |
| George McDaniel | Mr. Jameson | Steve | 1 | 1 |
| Michael Ensign | Dr. George Leeson | Doctor | 1 | 1 |
| Steve Vinovich | Ken Seaver | Ben Baxter | 1 | 1 |
| Terry Kiser | Sal Cassella | Max, Mr. Canon | 1 | 2 |
| Will MacMillan | Judge Colonel Barney Massien | Policeman | 1 | 1 |
| Ben Slack | Morris Clark | John | 1 | 1 |
| Claudette Nevins | Sarah Schindler | Barbara | 1 | 1 |
| Daniel Greene | Jack Seiling | Police Officer | 1 | 1 |
| Ian Abercrombie | Gunther Hall | Lawyer | 1 | 1 |
| John Lawrence | Reuben | The Minister | 1 | 1 |
| Natalie Core | Helen | Miss Fitsimmons | 1 | 1 |
| Peter Schuck | Dr. Herbert Towel | Pete | 1 | 1 |
| Rudolph Willrich | Evan Pontell | Special Agent Roth | 1 | 1 |
| Stuart Nisbet | Grant | Mr. Crawford | 1 | 1 |
| Ken Letner | Captain Charles Laughlin | Policeman | 1 | 1 |
| Reid Shelton | Judge Nelson Aldrich | Nathan Barrish | 1 | 1 |
| George Dickerson | Jim Haas | The Boss | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.