| Britt Reid / The Green Hornet | Gordon Jones | |
| Michael Axford | Wade Boteler | |
| Lenore "Casey" Case | Anne Nagel | |
| Kato | 陆锡麒
 | |
| Jasper Jenks | Phillip Trent | |
| Curtis Monroe | Cy Kendall | |
| Police Commissioner [Chs. 1 5 9 13] | Stanley Andrews | |
| District Attorney [Chs. 4 10] | Selmer Jackson | |
| Judge Stanton [Chs. 1 9 10 13] (as Joe Crehan) | Joseph Crehan | |
| Henchman Dean | Walter McGrail | |
| Henchman Corey | Gene Rizzi | |
| Henchman Pete Hawks | John Kelly | |
| D.H. Sligby [Ch. 7] | Eddie Dunn | |
| Felix Grant Attorney [Ch. 1] | Edward Earle | |
| Phil Bartlett [Chs. 3-4] | Ben Taggart | |
| Meadows [Ch. 5] | Clyde Dilson | |
| Bob Stafford [Chs. 7 11] | Jerry Marlowe | |
| Max Gregory [Ch. 11] (as Fredrik Vogeding) | Frederick Vogeding | |
| Mr. West [Ch. 6] (uncredited) | Raymond Bailey
 | |
| The D.A.'s Valet [Ch. 4] (uncredited) | Wilson Benge | |
| Mr. Cooper [Ch. 12] (uncredited) | James Blaine | |
| Jay Lavenson [Ch. 8] (uncredited) | Robert Brister | |
| Policeman [Ch. 2] (uncredited) | Jack Carr | |
| Election Judge [Ch. 10] (uncredited) | Ed Cassidy | |
| Acme Driver Bill [Ch. 7] (uncredited) | 莱恩·钱德勒 | |
