Fumie Kashiyama

as Marina (voice)

Mariko Miyagi

as Fritz the Dolphin (voice)

Tarō Shigaki

as Prince (voice)

Ichiro Nagai

as Whistler (voice)

Kenichi Ogata

as Oval Shark (voice)

Haruko Kitahama

as Witch (voice)

Miyoko Aso

as Mermaid Crone (voice)

Kazuko Sugiyama

as Marina's Sister (voice)

Kazuko Sawada

as Jemmy the Cat (voice)

Nana Yamaguchi

as Prince's Mother (voice)

Rihoko Yoshida

as Suomi Princess (voice)

Kaneta Kimotsuki

as Crab / Conch (voice)

Kosei Tomita

as Duke the Whale (voice)

Hidekatsu Shibata

as Mermaid King (voice)