Mario Freaks Orchestra was the name given to the group of performers on several Nintendo arrange albums published by Nippon Columbia. There was no set lineup; different musicians arranged and performed on different albums.

Ikuro Fujiwara: keyboards (CA-4634)
Seiji Kameda: keyboards, synthesizers, computer programming (CA-4474)
S・TRAD: keyboards, synthesizers, computer programming, percussion, electric guitar (CA-4473)
Kisow Yamanaka: keyboards, synthesizers, computer programming (COCA-6327)

Kiyoshi Hagiya: electric guitar (CA-4473)
Kazuhiro Matsuo: electric guitar (CA-4474)
Teiji Mihata (三畑 貞二): electric guitar (CA-4634)
Hiroshi Nagashima: electric guitar (COCA-6327)
Syuji Nakamura: electric guitar (CA-4473)
Jun Sumida: electric guitar (CA-3393, COCA-6327)

Nobuo Yagi: harmonica (CA-4473)

Masato Matsuda: keyboards (COCA-6327)
Ichiro Nagata: keyboards (COCA-6327)

Masahiro Sayama: acoustic piano (CA-4473)

Shigeo Fuchino: saxophone (CA-3393, COCA-6327)
Yoshitaka Kuratomi: saxophone (CA-4474)

Susumu Kazuhara: trumpet (CA-4473)
Futoshi Kobayashi: trumpet (CA-4474)

Naoki Suzuki (鈴木 直樹): synthesizer operation (CA-4634)
Jun Araki (荒木 純): synthesizer programming (CA-3393, CA-4634)