Godzilla

Raymond Burr

Steve Martin

Akira Takarada

Ogata

Akihiko Hirata

Dr. Serizawa

Takashi Shimura

Dr. Yamane

Momoko Kôchi

Emiko Yamane

Emilio Cigoli

Steve Martin (voice)

Rita Savagnone

Emiko Yamane (voice)

Giuseppe Rinaldi

Ogata (voice)

Vittorio Cramer

George Lawrence (voice) (as Vittorio Kramer)

Pino Locchi

Security Officer Tomo Iwanaga (voice)

Gianfranco Bellini

Dr. Serizawa (voice) (uncredited)

Bruno Persa

Dr. Yamane (voice) (uncredited)