Mohammad Mainul Islam (born 4 December 1959) is a retired lieutenant general of the Bangladesh Army.

[3] Mainul Islam completed his master's degree in strategic studies in 2003 from United States Army War College, Pennsylvania.

During his long 40-year career, he served in a variety of command, staff and instructor appointments and was widely known for effectively handling critical issues.

He served as Chief Instructor of Armed Forces war course (AFWC) wing of National Defence College Bangladesh.

He served as the director general of the Bangladesh Rifles from 28 February 2009 to 9 May 2010 and was given the responsibility of reorganizing the mutiny devastated force.

[9] After forced withdrawal of Bangladesh Battalion Headquarters from UN camps in Ivory Coast, Bangladeshi peacekeepers faced image crisis; by negative branding like "armed tourists" in the mission area.