The scholar breathed his last around 10:30 pm today, said family sources.
Earlier this month, he was admitted to Dhaka's United Hospital as his physical condition deteriorated.
His son Sahjeb Saadat said: "My father was admitted to the ICU of the hospital as he suddenly fell sick."
Dr Saadat Husain was born on November 24, 1946. He obtained his Ph D Degree in Economics from Boston University, USA, in 1987.