A Long Island high school teacher was busted for sexually abusing a female student, Suffolk cops said.

Stephen Malusa, 47, a science teacher at Ward Melville High School who lives on Seminole Street in Selden, was arraigned in First District Court in Central Islip Tuesday on charges of third-degree sexual assault and endangering the welfare of a child.

Police said the attack happened last May, but released no other details about the case, including the alleged victim’s age.