Is Hinata dead

NO, Hinata isn't dead. After suffering wounds from Pain's blow, she was healed by Sakura. Her wounds weren't fatal, but it could have been if they didn't find her on time.

No Hinata is not dead after naruto defeated Nagato aka pain brought everyone he killed there back to life (kakashi,chiji's father,Hinata etc).When naruto was fighting pain he discovered that the real one was not there and he killed those and found the real one and then they talked and pain did a forbeddin jutsu and and pain killed himself to bring everyone back