Muhammad Ataul Gani Osmani, better known by General M.A.G. Osmani (1 September 1918-16 February 1984) was the supreme commander of Mukti Bahini and Bangladesh Armed Forces during the Bangladesh Liberation War.
Osmani was born in Sunamganj, Sylhet Division on 1 September 1918. He passed matriculation from Sylhet Government Pilot School. Later, he graduated in Aligarh Muslim University, India. He was a descendant of Nizamuddin Osmani of Dayamir, Sylhet.
With the formation of Mujib's government on 17 April 1971, Osmani was appointed commander in chief of all Bangladesh Armed Forces. Under his direct command, Osmani divided up the entire declared Bangladesh territory to 11 sectors. Each sector was under the command of a trained military officer with the title of Sector Commander. Each sector also had sub-sectors with sub sector commanders.