- Michael Keith
- Eric Carter
- Harry Holcombe
- Dr. Arnold Johnson
- James Yagi
- Yutaka Omura
- Tadao Takashima
- Osamu Sakurai
- Kenji Sahara
- Kazuo Fujita
- Ichirô Arishima
- Mr. Tako
- Yû Fujiki
- Kinsaburo Furue
- Jun Tazaki
- General Masami Shinzo
- Akihiko Hirata
- Dr. Shigezawa
- Mie Hama
- Fumiko Sakurai
- Yoshifumi Tajima
- Captain of Fujita's Ship - Japanese version only
- Akiko Wakabayashi
- Tamiye
- Akemi Negishi
- Chikiro's Mother (Dancing Girl)
- Yoshio Kosugi
- Farou Island Chief
- Ikio Sawamura
- Witch Doctor
- Someshô Matsumoto
- Dr. Onuki
- Kô Mishima
- Official
- Sachio Sakai
- Obayashi (Mr. Tako's assistant)
- Tatsuo Matsumura
- Dr. Makino
- Senkichi Ãmura
- TTV Translator Konno
- Ren Yamamoto
- Commander of Operation Burial
- Haruya Katô
- Obayashi's assistant
- Yasuhisa Tsutsumi
- General's Aide #2
- Shin Ãtomo
- Captain of Vessel
- Nadao Kirino
- General's Aide #1
- Naoya Kusakawa
- Newspaper Reporter
- Mitsuo Tsuda
- Ground Self Defense Force Executive
- Takuzô Kumagai
- Police Executive
- Shirô Tsuchiya
- Fisherman / Evacuee
- Kenzô Tabu
- Dreary Newscaster
- Haruya Sakamoto
- Eastern Army Facility Manager
- Hideo Shibuya
- Member of Press Corp
- Harold Conway
- Scientist in Sub
- Douglas Fein
- Commander Roberts
- Osman Yusuf
- Submariner
- Shôichi Hirose
- King Kong
- Haruo Nakajima
- Godzilla / Faro Islander of the monitoring base
- Katsumi Tezuka
- Godzilla
- Bin Furuya
- JSDF correspondent
- Cliff Harrington
- Al the helicopter co-pilot
- Shigeo Katô
- Pacific Pharmaceutical employee, newspaper reporter
- Thomas Korzeniowski
- General
- Akio Kusama
- Ground self-defense force executive
- Junnosuke Suda
- Pacific Pharmaceutical Employee
- Kamayuki Tsubono
- Sailor Daiyasumaru
- Gary Collins
- Submariner
- Robert Dunham
- US Navy Pilot
- Victor Millan
- Rodrigo Infante
- Les Tremayne
- Commander Roberts / General Shinzo / Narrator (voice) (uncredited)
