• 
  Aya Hirano

  Haruhi Suzumiya
• 
  Crispin Freeman

  Kyon
• 
  Wendee Lee

  Haruhi Suzumiya
• 
  Michelle Ruff

  Yuki
• 
  Yuki Matsuoka

  Tsuruya-san (4 episodes, 2006)
• 
  Akio Ôtsuka

  Arakawa (2 episodes, 2006)
• 
  Toshiyuki Morikawa

  Yutaka Tamaru (2 episodes, 2006)
• 
  Steve Kramer

  Umpire (1 episode, 2006)

• 
  Kari Wahlgren

  Tsuruya  (6 episodes, 2006)
• 
  Johnny Yong Bosch

  Itsuki Koizumi (11 episodes, 2006)
• 
  Stephanie Sheh

  Mikuru Asahina (13 episodes, 2006)
• 
  Dave Wittenberg

  Computer club leader (2 episodes, 2006)
• 
  Takeshi Aono

  Manager (1 episode, 2006)
• 
  Aiko Hibi

  Obachan B (1 episode, 2006)
• 
  Liam O'Brien

  Baseball team captain (1 episode, 2006)

• 
  Bridget Hoffman

  Ryoko Asakura (2 episodes, 2006)
• 
  Kazuhiko Inoue

  Keiichi Tamaru (2 episodes, 2006)
• 
  Sam Riegel

  Kunikida (5 episodes, 2006)
• 
  Daisuke Ono

  Itsuki Koizumi
• 
  Minori Chihara

  Yuki Nagato
• 
  Minoru Shiraishi

  Taniguchi
• 
  Tomokazu Sugita

  Kyon
• 
  Yuko Goto

  Mikuru Asahira

• 
  Nagaru Tanigawa

  Nagaru Tanigawa