No, there isn't a third season (unfortunatly) but there are rumors that there might be. Some say the third season will air this year, and some say like around 2012 o 2013. But no one knows exactly yet. Sorry.
On the other hand, Let us pray for a season three. :3
its completely my guessing and rumors ive herd from some kind in the lowest lvls of anime business but they are holding VK season 3 to leave room for the new series with potential and then releasing it after más of the manga is done ( if they started right now they would have to stop midway anyways for lack of episodes )
im not sure sorry but their has to be a season 3 too many fans of it and if tu go to their shops and buy vampire knight stuff we might get lucky and they will make season 3
No there is not matsuri hino finished the original book series and tried to make más of vampire knight but then made it focus on zero and yuki’s relationship and on how ai and ten grew up as kids.