Lieutenant colonel Abu Osman Chowdhury (1 January 1936 – 5 September 2020) was a Bangladeshi war hero and freedom fighter.

Sensing imminent danger he left Kushtia on early morning of 26 March 1971 and headed to Chuadanga via Jhenaidah while local political workers have already revolted.

[5][6] Later the 4th wing of EPR, led by Major Chowdhury and reinforced with Police and Ansar personnel and local youth, attacked 27 Baluch of Pakistan Army stationed at Kushtia and eliminated almost 2 companies.

There, his NCOs briefed him of the overall situation including formal organisation of local resistance in the wake of the crackdown at Dhaka.

In the meantime local Awami League leader Dr Ashab Ul Haq, who had earlier declared war against the occupational Pakistan armed forces the same morning at a public meeting, had contacted him over telephone and invited him to an emergency meeting with the public leaders and representatives of the local administration.

While Chowdhury was given the position of the Commander, Dr Ashab Ul Haq, MPA became the Chief Advisor and Barrister Abu Ahmed Afzalur Rashid alias Badal Rashid, MNA, and Advocate Yunus Ali, MPA, were made Deputy Chief Advisors.

Chowdhury held the position until division of Bangladesh war commands into 11 Sectors by the Provisional Government on 11 July 1971.

After the independence of Bangladesh he was promoted to the rank of Lieutenant Colonel and was appointed as the Director of Army Service Crops.