Admiral Mohamed Omar Osman (born 1940) (Somali: Maxamad Cumar Cismaan) is a Somali admiral, war hero and the incumbent chairman of the Ogaden National Liberation Front (ONLF).

Afterward, he was appointed commander of the Somali Navy and promoted to the rank of vice admiral, as chief of naval operations, he oversaw and commanded navy forces in the Ogaden war against the Ethiopian Navy and commanded naval infantry units to assist the Army.

After the collapse of the central government in Somalia in 1991, he returned to the Somali Region in Ethiopia, where in 1998 he was chosen to be the leader of the ONLF at the Party Congress.

[1] In the later years, Admiral Osman and his supporters had been in a power struggle against a group led by the ONLF head of Planning and Research Department, Dr. Mohamed Sirad Dalool, who was assassinated March 2009.

[2] This has reportedly led to a split in the ONLF, with one faction loyal to Admiral Osman, while another, led by Abdiwali Hussein Gas, holds Admiral Osman responsible for Dr. Dalool's death, which he has not commit, in fact, it is to be said that Dr. Dalool and Admiral Osman were very close friends and that he relied heavily on Dr. Dalool for advice and that he was a key member who was important of the party.