• 
  Ellen David

  Miss Martin
• 
  Pat Fry

  Caillou's Dad
• 
  Pauline Little

  Grandma
• 
  Melissa Pirrera

  Sarah
• 
  Jennifer Seguin

  Caillou's Mom
• 
  Merlee Shapiro

  Storyteller
• 
  Evan Smirnow

   Cailette Singer (74 episodes, 1997-2003)
• 
  Bob Stutt

  Gilbert

• 
  Jesse Vinet

  Rosie
• 
  Annie Bovaird

  Caillou
• 
  Al Gravelle

  Additional Voices
• 
  George Morris

  Grandpa
• 
  Graeme Jokic

  Leo
• 
  Pier Kohl

  Rexy
• 
  Sofie Uretsky

  Clementine

• 
  Brigid Tierney

  Rosie
• 
  Bryn McAuley

  Caillou
• 
  Matt Ficner

  Teddy