Grigory Alexandrovich Marchenko (or Grigori Alexandrovich Marchenko) (born 1959 in Kazakhstan) is a Kazakhstan financier, banker and politician.
Marchenko was the Chairman of the Executive Board and CEO of Halyk Bank.
He served as a Deputy Prime Minister of Kazakhstan in 2004.
He is the Honorary Consul of the Singaporean Government to the Kazakh government since November 3, 2006 as well as the Honorary Consul of the Kingdom of Spain in Almaty.
He won Euromoney's 2003 Central Bank Governor of the year award.
He also was chosen as the best financier of the year ("the Choice of 2000 of the Republic of Kazakhstan", "the Choice of 2005 of the Republic of Kazakhstan").
He was awarded with a breastplate "Honored Employee of the National Bank of Kazakhstan" in 2012.
From January 22, 2009, until October 1, 2013, he was the chairman of the National Bank of the Republic Kazakhstan.