Police arrested Israfil Azad Shwapon, 23, son of late Taiyab Mia and Nizam Uddin, 22, son of Chan Mia, all hailing from South Charmajid village in East Charbata Union of the upazila on Saturday morning.
Inspector Ibrahim Khalil of Charjabbar Police Station said the girl was picked up by auto-rickshaw driver Swapon after assuring her mother to reach her home without fare.
Later around 9 pm, the girl was taken to a lonely place in South Char Majid village where Nizam and Swapon in turns raped her, he added.
Following morning the girl returned home and informed her family about the incident.
Later, her brother filed a case with Charjabber police station on Friday night.
The girl has been sent to Noakhali General Hospital on Saturday noon for medical test.
Meanwhile, Ujma Shukrana, judge of Noakhali Cognisance Court-2, sent the arrestees to jail after police produced them before it this afternoon, Inspector Khalil added.