cast
- Richard Carlson
- David Reed
- Julie Adams
- Kay Lawrence
- Richard Denning
- Mark Williams
- Antonio Moreno
- Carl Mala
- Nestor Paiva
- Lucas
- Whit Bissell
- Edwin Thompson
- Bernie Gozier
- Zee
- Henry Escalante
- Chico
- Sydney Mason
- Dr. Matos
- Ricou Browning
- Gill-Man (in water)
- Rodd Redwing
- Louis
- Perry Lopez
- Tomas
- Ben Chapman
- Gill-Man
crew
- Jack Arnold
- Director
- William Alland
- Producer
- Arthur A. Ross
- Screenwriter
- Harry J. Essex
- Screenwriter
- Maurice Zimm
- Screen Story
- Charles S. Welbourne
- Cinematographer, Special Effects
- James C. Havens
- Cinematographer
- William Snyder
- Cinematographer
- Hans Salter
- Composer (Music Score)
- Henry Mancini
- Composer (Music Score)
- Herman Stein
- Composer (Music Score)
- Joseph E. Gershenson
- Composer (Music Score), Musical Direction/Supervision
- Ted Kent
- Editor
- Bernard Herzbrun
- Production Designer
- Hilyard M. Brown
- Production Designer
- Ray Jeffers
- Set Designer
- Russell A. Gausman
- Set Designer
- Rosemary Odell
- Costume Designer
- Joe Lapis
- Sound/Sound Designer
- Leslie I. Carey
- Sound/Sound Designer
- Fred Frank
- First Assistant Director
- Ricou Browning
- Stunts
- Bud Westmore
- Makeup
