- Raymond Burr
- Steve Martin
- Toyoaki Suzuki
- Shinkichi
- Frank Iwanaga
- Dr. Yunaga, Security Officer
- Akira Takarada
- Ogata
- Akihiko Hirata
- Dr. Serizawa
- Sachio Sakai
- Hagiwara
- Takashi Shimura
- Dr. Yamane
- Momoko Kôchi
- Emiko
- Raymond Royer
- (voice)
- Michel Francois
- (voice)
- Roland Ménard
- (voice)
- Violette Jean
- (voice)
- René Blancard
- (voice)
- Maurice Favières
- (voice) (as Maurice Favieres)
- Dominique Rémy
- (voice)
- Gérard Kérise
- (voice) (as Gerard Keryse)
- Louis Perdoux
- (voice)
- Claude Dupuis
- (voice) (as Claude Dupuy)
- Eddy Rasimi
- (voice)
- Dale Ishimoto
- Add in on island dance scene
- Junnosuke Suda
- Tokaido Line Driver
- Kamayuki Tsubono
- Japan Coast Guard Officer / Shikine Newspaper Reporter
- Shizuko Azuma
- Partygoer
- Mikel Conrad
- George Lawrence
- Hiroshi Hayashi
- Chairman of Diet Committee
- Shizuko Higashi
- Angry Woman at Diet
- Ishirô Honda
- Power Station Worker
- Saburô Iketani
- News Reporter
- Ren Imaizumi
- Radio Operator
- Kiyoshi Kamata
- Partygoer's Escort
- Akio Kusama
- Otoshima Islander
- Kokuten Kôdô
- The Old Fisherman
- Tsuruko Mano
- Mrs. Sieji
- Lee Miller
- Man in Line at Airport
- Fuyuki Murakami
- Dr. Tabata
- Haruo Nakajima
- Godzilla / Power Station Worker (uncredited)
- Junpei Natsuki
- Power Substation Engineer
- Toranosuke Ogawa
- President of Company
- Takeo Oikawa
- Chief of Emergency Headquarters
- Tadashi Okabe
- Dr. Tabata's Assistant
- Seijirô Onda
- Oyama
- Kenji Sahara
- Young Lover on the sound
- Keiji Sakakida
- Mayor Inada
- Tamae Sengo
- Mother
- Kin Sugai
- Ozawa-san
- Jiro Suzuki
- Godzilla
- Ryosaku Takasugi
- Godzilla
- Katsumi Tezuka
- Godzilla / Hagiwara's Editor (uncredited)
- Yasuhisa Tsutsumi
- Soldier
- Ren Yamamoto
- Seiji
