Das Mohapatra had been admitted to a private hospital here two days ago and breathed his last during treatment, family sources said.
He is survived by a son and daughter, they said.
Odisha Chief Minister Naveen Patnaik has condoled the demise of Das Mohapatra and described the late leader as an "astute politician and prolific writer." Patnaik also conveyed his deep sympathy to the bereaved family.
A multi-faceted personality and three-time MLA, Das Mohapatra was a minister in the ministries of Nandini Satpathy J B Patnaik.
He had also authored a number of Odia novels and won several awards.
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