Oak Bluffs police are searching for Alyssa Whitney, a 15-year-old town resident reported missing.
She's 5-feet, 4 inches, 120 pounds, with blonde hair and green eyes.
She was last seen wearing an aqua-green and puffy jacket, carrying a green denim backpack with an Aztec pattern, police said.
"She was last seen in Oak Bluffs at her school bus stop on County Road," police said in a statement. "School officials are unsure if she ever made it to school. She was marked absent and wasn't seen on school property.
"Her parents believe that she may be in the company of an older male who is driving her around."
Police said anyone with information on her whereabouts should call them at 508-693-0750.