Yuria Kozuki as Ponyo (voice)

Hiroki Doi as Sosuke (voice)

George Tokoro as Fujimoto (voice)

Tomoko Yamaguchi as Risa (voice)

Yuki Amami as Gran Mamare (voice)

Kazushige Nagashima as Koichi (voice)

Akiko Yano as Ponyo's Sister (voice)

Shin'ichi Hatori as Anchorman (voice)

Tokie Hidari as Kayo (voice)

Rumi Hiiragi as Young Mother (voice)

Tomoko Naraoka as Yoshie (voice)

Kazuko Yoshiyuki as Toki (voice)

Eimi Hiraoka as Kumiko (voice)

Nozomi Ōhashi as Karen (voice)

Akiko Takeguchi as Noriko (voice)

Eiko Kanazawa as (voice)

Akihiko Ishizumi as (voice)

Tomie Kataoka as (voice)

Shirou Saitou as (voice)

Mutsumi Sasaki as (voice)

Keiko Tsukamoto as (voice)

Ikuko Yamamoto as (voice)

Michiko Yamamoto as (voice)

Yoshie Yamamoto as (voice)

Yusuke Tezuka as (voice)