Grigory Alexandrovich Marchenko (or Grigori Alexandrovich Marchenko; born December 26,59) is a Kazakh financier, banker and politician. Marchenko was the Chairman of the Executive Board and CEO of Halyk Bank. He served as the First 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 was twice the chairman of the National Bank of the Republic Kazakhstan: from 1999 to 2004 and from 2009 to 2013.