A 14-year-old student was slashed in the head by a fellow pupil Tuesday morning at a Queens public high school, authorities said.

The victim, who is the son of a school safety agent, was attacked near a staircase inside Benjamin N. Cardozo High School in Bayside around 8:50 a.m., police and sources said.

Emergency responders rushed the victim to North Shore University Hospital in Long Island with non-life-threatening injuries, police said.

The boy suffered a slash wound to the left side of his forehead, a source said.

Meanwhile, the high school — which sources said is not equipped with metal detectors — remained on lockdown as authorities searched for the student responsible for the slashing.

The attacker is possibly 12 or 13 years old and is known to the victim, police said.

According to sources, the suspect is 5 feet 10, wearing a black top and carrying a black Jordan bookbag.

Department of Education spokeswoman Miranda Barbot said in a statement: “The safety of students and staff is our top priority, and NYPD and EMS immediately responded to a serious incident at Cardozo High School this morning where a student was transported to the hospital in stable condition.”

“We are working with NYPD as they conduct an investigation, and are taking additional safety measures at the school.”

Additional reporting by Larry Celona and Tina Moore