| Person | Type | Job | Role(s) |
|---|---|---|---|
 Al Wyatt Sr. | Crew | Crew | Stunts |
 Arthur A. Ross | Crew | Writing | Screenplay |
Bernard Herzbrun | Crew | Art | Art Direction |
 Bud Westmore | Crew | Costume & Make-Up | Makeup Artist |
E. Thomas Case | Crew | Costume & Make-Up | Makeup Artist |
Fred Frank | Crew | Directing | Assistant Director |
Hans J. Salter | Crew | Sound | Original Music Composer |
Harry Essex | Crew | Writing | Screenplay |
 Henry Mancini | Crew | Sound | Original Music Composer |
Herman Stein | Crew | Sound | Original Music Composer |
Hilyard M. Brown | Crew | Art | Art Direction |
 Jack Arnold | Crew | Directing | Director |
Jack Kevan | Crew | Costume & Make-Up | Makeup Artist |
Jack N. Young | Crew | Crew | Stunts |
James Curtis Havens | Crew | Camera | Underwater Camera |
Joan St. Oegger | Crew | Costume & Make-Up | Hairstylist |
Joe Lapis | Crew | Sound | Sound |
Joseph Gershenson | Crew | Sound | Music Director |
Leslie I. Carey | Crew | Sound | Sound |
Maurice Zimm | Crew | Writing | Story |
Milton Rosen | Crew | Sound | Music |
 Polly Burson | Crew | Crew | Stunt Double |
Ray Jeffers | Crew | Art | Set Decoration |
Robert Emmett Dolan | Crew | Sound | Music |
Russell A. Gausman | Crew | Art | Set Decoration |
Scotty Welbourne | Crew | Camera | Still Photographer |
Ted J. Kent | Crew | Editing | Editor |
 Ted White | Crew | Crew | Stunts |
 William Alland | Crew | Production | Producer, Idea |
William E. Snyder | Crew | Camera | Director of Photography |
Ethmer Roten | Crew | Sound | Musician |
 Milicent Patrick | Crew | Visual Effects | Creature Design, Makeup Designer |
Russ Haverick | Crew | Directing | Assistant Director |
Chris Mueller | Crew | Costume & Make-Up | Makeup Artist |
Albert E. Kennedy | Crew | Sound | Sound Editor |
Ray Craddock | Crew | Sound | Sound Editor |
Robert Hickman | Crew | Costume & Make-Up | Makeup Artist |
Everett Brown | Crew | Camera | Grip |
Foster Thompson | Crew | Production | Unit Manager |
Gene Poole | Crew | Crew | Stunts |
James R. Wolfe | Crew | Crew | Driver |
Ginger Stanley | Crew | Crew | Stunts |
 Antonio Moreno | Cast | Actor | Dr. Carl Maia |
 Art Gilmore | Cast | Actor | Narrator (voice) (uncredited) |
Ben Chapman | Cast | The Gill Man On Land (uncredited) | |
 Bernie Gozier | Cast | Actor | Zee |
Henry A. Escalante | Cast | Chico | |
 Julie Adams | Cast | Actress | Kay Lawrence |
 Nestor Paiva | Cast | Actor | Captain Lucas |
 Perry Lopez | Cast | Actor | Tomas (uncredited) |
 Richard Carlson | Cast | Actor | Dr. David Reed |
 Richard Denning | Cast | Actor | Dr. Mark Williams |
 Ricou Browning | Cast | Actor | The Gill Man In Water (uncredited) |
 Rodd Redwing | Cast | Actor | Luis (uncredited) |
 Whit Bissell | Cast | Actor | Dr. Edwin Thompson |
 Sydney Mason | Cast | Actor | Dr. Matos (uncredited) |
| Person | Type | Job | Role(s) |
