Sergei Nikolayevich Rumas[a] (born 1 December 1969) is a Belarusian politician and economist who served as Prime Minister of Belarus from August 2018 to June 2020.

[3] In 2001, Rumas was awarded a Candidate of Sciences degree in economics, his thesis was entitled "Ways of optimization of resource structure of commercial bank".

During the financial crisis of 2011, Rumas supervised the creation of a program of structural reforms, which was criticized by the president Alexander Lukashenko and his adviser Sergey Tkachyov.

Rumas advocated privatization, foreign investments, and abolition of preferential loans for state-owned companies[6][7][5] In 2012, Alexander Lukashenko appointed him a head of Development Bank of the Republic of Belarus.

[8] The decree had a clause on the subsequent approval of Rumas's appointment in the House of Representatives, but the Constitution prescribes an opposite procedure.