Credits
The people who worked on the design and production of Mario Party 9 are listed below
| Role | Name |
| Game Director | Shuichiro Nishiya |
| Chief Planning Director | Tatsumitsu Wantabe |
| Planning Directors | Takeru Sugimoto, Yuji Asano, Shigeru Okita, Makoto Eguchi, Hiroyuki Seki, Noriyuki Saeki, Satoru Imamura & Fumihisa Sato |
| Planning Team | Yuki Maruyama, Naoaki Yamashita, Hayato Minagawa, Naonari Kaga, Yukiko Nakata, Tsuyoshi Matsumoto, Masashi Oishi, Atsushi Nakao, Yuya Rokuyama, Satomi Yamakawa, Hiroshi Kurimoto, Shigeyasu Ohashi, Junnosuke Tschimoto, Ayumu Kawashiro, Kenta Ogawa, Yamato Sato, Yohei Nakata & Ryota Saruwatari |
| Chief Programming Director | Shinji Sibasaki |
| Programming Directors | Noriyasu Arata, Tadao Shohyama, Akihiro Terada & Haruhiko Tanuma |
| Programming Team | Tadamasa Ishizaka, Shinichi Hiramori, Kazuhiro Enami, Hisashi Yoshida, Masayuki Shinohara, Tetsuro Kani, Shinnosuke Ohashi, Izumi Fukuda, Takashi Iwanaga, Norifumi Hira, Takahiro Matsumoto, Yasutaka Ikeda, Daizou Yamauchi, Hiroyuki Watanabe, Junichi Nagasaki, Sayaka Fukuyama, Nobuya Wada, Tomaoki Tanaka, Daichi Ishii, Kuniaki Miyauchi, Kana Mizota, Takanori Ode, Kenichiro Obara, Satoshi Yoshida, Tsubasa Yamaguchi, Masayuki Kino, Aya Yoshii, Takayuki Kimata, Takeshi Hida, Takayuki Hayase |
| Chief Design Director | Hiroshi Hayashi |
| Design Directors | Akiyoshi Kakinuma, Takahiro Karino, Takahito Tatezawa, Takahiro Asano & Yukinori Goto |
| Graphic Design Team | Toshifumi Sekijima, Susumu Kuribayashi, Shunsaku Yamamoto, Kazuhisa Okamoto, Takamitsu Manabe, Kazuaki Henmi, Tsuyoshi Mizuguchi, Nana Tanaka, Hayato Ogawa, Masahiko Yamada, Minori Nishioka, Huichung Lee, Tomoaki Watanabe, Natsumi Yamada, Akiko Nishizawa, Hiroko Kinjo, Kango Sumi, Yoko Asari, Hideki Morinaga, Yoshinori Ikeshita, Tsukasa Tanaka, Kanako Uto, Yasuhiro Ando, Akira Mizoguchi, Mikio Kita, Hiroshi Okajima, Yurie Okubo, Shinsuke Miyazaki, Shouhei Higashi, Keisuke Mizutani, Takuya Tawaratsumida, Takayuki Shimokawa, Asami Matsushima, Miki Nakamura, Saki Ideguchi, Miho Yamaguchi, Tadashi Miura, Yumi Futagawa, Shouichi Kawamura, Keisuke Yonaha, Yuka Ogawa, Hiroyuki Okamura, Yoshinori Hirai, Haerim Kang, Mariko Kawase, Arisa Kurosu, Akiko Tanno, Michiyo Nojiri, Rinako Asano & Masafumi Kimura |
| Sound Director | Hiroyuki Tsuboguchi |
| Music Director | Charmy Ishi |
| Music | Toshiki Aida & Ryosuke Asami |
| Sound Effects Director | Yuhki Mori |
| Sound Effects | Kotaro Baba, Tomomitsu Matsushita & Yutaka Takahashi |
| Sound Supervisor | Koji Kondo |
| Character Voices | Charles Martinet, Sam Kelly, Deanna Mustard, Kazumi Totaka, Nate Bihldorff, Atsushi Masaki, Kenny James, Caety Sagoian, Takashi Nagasako, Katsumi Suzuki, Motoki Takagi, Delores Rogers, Dex Manley, Toru Asakawa, Jeff Minnerly, Pablo Magaz, Patrick Mugalu, Alessandro Ricci, Peter Stark & Javier Fernandez-Pena |
| Graphic Supervisors | Kanae Dohta, Sota Kagino, Ryusuke Yoshida, Naoko Ayabe & Tsuyoshi Watanabe |
| Logo Design | Ryo Koizumi & Shiori Adachi |
| North American Localization Management | Nate Bihldorff, Reiko Ninomiya, Tim O'Leary & Leslie Swan |
| North American Localization | Mike Drucker, Matylda Kramarz, Anne-Marie Lapierre, Cesar Perez, Galia Rodriguez Hornedo & Ethan Stockton |
| European Localization Management | Erkan Kasap & Ozlem Zaimoglu |
| European Localization Producers | David Ryan & Hidetoshi Sakamoto |
| Translation Coordination | Daniele Braglia |
| English Translation | Ethan Stockton & Mike Drucker |
| Translation UK Adaption | Charlotte Steggall & Kevin Murray |
| French Translation | Sabrina Jouillat & David Causseque |
| Italian Translation | Mirko Capocelli & Vincenzo Russco |
| German Translation | Sven Potzl & Gunnar Friedrich |
| Spanish Translation | Miguel Rodriguez Ramos & Miguel Sanchez Esteban |
| Quality Assurance/Testing | NOE Quality Assurance |
| Debug | NOA Product Testing |
| Special Thanks | Stephane Arlot, Eric Bush, Scott Callahan, Sean Egan, Nicko Gonzalez de Santiago, Alexandre Higashi, Sara Hoad, Kyle Hudson, Teresa Lillygren, Tomoko Mikami, Masayasu Nakata, Joshua Newman, Kindra Timmerwilke, Marko Wallenius, Stephen Ward, Mitsuo Imamoto, Takehiro Oyama, Akihiro Sakatani, Miyuki Murato, Tomoyoshi Yamane, Tomomi Sano, Tomohiro Yamamura, Kenji Yamamoto, Akito Nakatsuka, Kensuke Tanabe, Risa Tabata, Mitsuhiro Kadowaki, Osamu Tsujikawa, Akira Matsumoto , Kenji Ohira, Hisao Hasunuma, Mitsu Hasanuma, Kazuyuki Makishima, Tatsuo Masuda & Shinji Yoshikawa |
| Coordination | Yoshinori Tsuchiyama & Jumpei Horita |
| Senior Director | Kenji Kikuchi |
| Supervisors | Shigeru Miyamoto & Takashi Tezuka |
| Associate Producer | Miyuki Hirose |
| Producers | Hiroshi Sato & Atushi Ikeda |
| Executive Producers | Satoru Iwata, Shinji Hatano & Hidetoshi Endo |
