- Gordon Jones
- Britt Reid / The Green Hornet
- Wade Boteler
- Michael Axford
- Keye Luke
- Kato
- Anne Nagel
- Leonore Case
- Phillip Trent
- Jasper Jenks
- Cy Kendall
- Curtis Monroe
- Stanley Andrews
- Police Commissioner [Chs. 1, 5, 8, 9, 13]
- Selmer Jackson
- District Attorney [Chs. 4, 10]
- Joseph Crehan
- Judge Stanton [Chs. 1, 9, 10, 13]
- Walter McGrail
- Dean
- Gene Rizzi
- Corey
- John Kelly
- Pete Hawks
- Eddie Dunn
- D.H. Sligby [Ch. 7]
- Edward Earle
- Felix Grant [Ch. 1]
- Ben Taggart
- Phil Bartlett [Chs. 3-4]
- Clyde Dilson
- Meadows [Ch. 5]
- Jerry Marlowe
- Bob Stafford [Chs. 7, 11]
- Frederik Vogeding
- Max Gregory [Ch. 11]
- Raymond Bailey
- Mr. West [Ch. 6]
- Brandon Beach
- Pedestrian
- Wilson Benge
- The D.A.'s Valet [Ch. 4]
- Arthur Berkeley
- Pedestrian
- James Blaine
- Mr. Cooper [Ch. 12]
- Chet Brandenburg
- Vendor
- Robert Brister
- Jay Lavenson [Ch. 8]
- Jack Carr
- Policeman [Ch. 2]
- Ed Cassidy
- Election Judge [Ch. 10]
- Lane Chandler
- Bill - Acme Driver [Ch. 7]
- Heinie Conklin
- Watchman [Ch. 10]
- Myrtis Crinley
- Clicker Bennie - Photographer [Ch. 8]
- Kernan Cripps
- Radio Car Cop [Chs. 1, 9, 10]
- George DeNormand
- Railroad Telegrapher [Ch. 11]
- Jimmy Dime
- Man at Coffee Stand [Ch. 7]
- Jack Donovan
- Bus No. 57 Driver [Ch. 6]
- Ann Doran
- Josephine Weaver Allen [Ch. 3]
- Ralph Dunn
- Andy - Thug
- Edgar Edwards
- Officer Tim Rand [Ch. 2]
- Douglas Evans
- Martin Mortinson [Chs. 2-3]
- Jim Farley
- Police Captain [Ch. 7]
- Wallace Gregory
- Acme Truck Driver [Ch. 7]
- Anne Gwynne
- Josephine Weaver [Ch. 3]
- Karl Hackett
- Gorman - Workman [Ch. 1]
- Chuck Hamilton
- Radio Car Driver [Chs. 4, 9, 10]
- Kenneth Harlan
- Charles Roberts [Ch. 7]
- John Harmon
- Lefty Bates [Chs. 12-13]
- Al Hodge
- The Green Hornet
- Reed Howes
- Charlie - Acme Driver
- Bill Hunter
- Joe [Ch. 3]
- Edward Keane
- Williams [Ch. 13]
- Colin Kenny
- Police Dispatcher
- Bob Kortman
- George Scanlon - Ballot Stuffer [Ch. 10]
- Alan Ladd
- Gilpin - Student Pilot [Ch. 3 and Ch. 4]
- Edward LeSaint
- Police Capt. Ridge [Ch. 2]
- George Lloyd
- Rocky Rockford [Ch. 6]
- Arthur Loft
- Joe Ogden
- Robert Long
- Lew - Mechanic Thug [Chs. 4-5]
- Pat McKee
- Thug at the D.A.'s Home [Ch. 4]
- Charles McMurphy
- Radio Cop
- Monte Montague
- Traffic Cop
- Philip Morris
- Traffic Cop [Ch. 1]
- Michael O'Hara
- Armored Car Driver [Ch. 10]
- William Pagan
- Slim - Junkyard Supervisor [Ch. 5]
- Jack Perrin
- Police Patrolman [Chs. 5, 9]
- John Pine
- Radio Cop
- Don Rowan
- Lou Markeim [Chs. 1-2]
- Paul Scardon
- Timothy Bryan [Ch. 7]
- Charles Sherlock
- Bud - Bus #16 Driver [Ch. 6]
- Philip Sleeman
- Henchman [Ch. 11]
- Brick Sullivan
- Police Patrolman [Ch. 10]
- Charles Sullivan
- Jake [Ch. 5]
- Harry Tenbrook
- Meadows' Garage Lookout [Ch. 5] / Policeman [Ch. 9] (uncredited)
- Sigfrid Tor
- Farrell
- Guy Usher
- Lynch [Chs. 8-9]
- Joe Whitehead
- Editor Gunnigan [Chs. 1, 2, 6, 8, 10, 12, 13]
