Nova (real name Samuel "Sam" Alexander), also known as Kid Nova, is a fictional character and superhero from Marvel Comics, appearing as a major character in the Nova and Champions comics.

The son of Nova Centurion Jesse Alexander, Sam would learn that his father's tales were true and succeed him after obtaining his helmet. Becoming a young superhero, Alexander would come across numerous threats while learning what it means to be a true hero. He is a co-founder and member of the Champions, and was a previous member of the Avengers, New Warriors, and the Nova Corps.

He was created by Jeph Loeb and Ed McGuinness, and first appeared in Marvel Point One #1 in November of 2011.