Khandkar Manwar Hossain or K. M. Hossain (Bengali: খোন্দকার মনোয়ার হোসেন) (30 April 1930 – 27 June 1999), was a Bangladeshi statistician. In 1950, he was among the students graduating from the first statistics course at Dhaka University. He was the founder of the Department of Statistics of Rajshahi University.