Police said the girl was waiting for a classmate outside a restroom at George Washington Carver Middle School in the 4400 block of McKinley Avenue on Friday when she was grabbed from behind.
The man dragged the girl about 15 feet before some students came to the screaming girl's aid, police said.
One of the students ran to call the principal. The man released the girl, ran to a trash can and jumped a fence onto Wadsworth Avenue, just south of Vernon Avenue, police said.
The suspect was described as Hispanic man in his 30s, about 6 feet tall and 185 pounds, with brown eyes and black hair. He had two cuts or a scar on his left eyebrow.