There are list of Grow Up Timmy Turner cast
- Drake Bell as Timmy Turner
- Daniella Monet as Tootie
- Susanne Blakeslee voiced Wanda (CGI)
- Tara Strong voiced Poof
- Daran Norris as Mr.Turner/voiced Cosmo (CGI)
- Jason Alexander as Cosmo (human)
- Cheryl Hines as Wanda (human)
- Devon Weigel as Vicky
- David Lewis as Mr. Crocker
- Mark Gibbon as Jorgen Von Strangle
- Teryl Rothery as Mrs. Turner
- Jesse Reid as A.J.
- Chris Anderson as Chester