No
There isn't a season 4 of H20 yet, but rumours of a fourth season have been neither confirmed nor denied.
2012
4/20
"V" was canceled in 2011.
April 6 2011
yes
it hasn't ! they are still figuring out what to do in this new season !
Probably not. The seires only lasted 2 seasons and then was cancelled
April 17th 2010.
January 2011
October 09
Sadly, there isn't going to be another season of Ghost Whisperer. The show was canceled at the finale of Season 5.