Will Zac Efron Vanessa Hudgens and Ashley Tisdale play a role in Highschool Musical 3?

No, Zac Efron, Vanessa Hudgens, and Ashley Tisdale did not play a role in Highschool Musical 3. The movie stars Zac Efron, Vanessa Hudgens, Corbin Bleu, Monique Coleman, Lucas Grabeel, Ashley Tisdale, Olesya Rulin, and Chris Warren Jr.