Mikalay Dzyemyantsyey (, , Nikolay Dementey; 25 May 1930 – 10 July 2018) was a Soviet and Belarusian politician who was chairman of the Belarusian Supreme Soviet. A former member of the Communist Party of Belarus, he was replaced by Stanislav Shushkevich as chairman because he sided with the leaders of the August 1991 coup against Soviet leader Mikhail Gorbachev. He died on 10 July 2018, aged 88.