Dr. Heydar Najaf oglu Huseynov (Azeri: Heydər Hüseynov) (3 April 1908, Yerevan – 15 August 1950, Baku) was an Azerbaijani philosopher and academician.
Huseynov was born in Erivan (present-day Yerevan, Armenia) into the petty bourgeois family of Haji Najaf Karbalai Huseynoglu and his wife Mashadi Gulsum, being the youngest of their six children.
Almost simultaneously Huseynov wrote his fundamental 733-page work entitled On the history of Azerbaijani phisolophical and sociopolitical thought in the nineteenth century (it was published in 1948).
"[4] Upon reviewing the monograph, the Committee for Stalin Prize in the field of literature and arts forwarded its observations to the Council of Ministers of the Soviet Union and as a result, Huseynov was stripped of his award.
Unable to deal with criticism from the state organs and his own colleagues and foreseeing his arrest, Huseynov committed suicide by slicing his veins on 15 August 1950.