Stephen Dhieu Dau Ayik is South Sudanese politician, banker by profession, and financial technocrat. He is a proven professional and held various cabinet positions in the Government of the Republic of South Sudan. He is a senior member of Sudan’s People Liberation Movement (SPLM) and had served in various cabinet positions. Stephen Dhieu Dau was the Minister of Finance and Planning until March 2018 in the RSS. He served as Minister of Petroleum and Mining and Minister of Commerce and Industry. Stephen Dhieu Dau is from Melut County, Upper Nile State, and belongs to the Nyiel section of the Padang Dinka ethnic group. In October 2022, President Salva Kiir appointed Stephen Dhieu Dau as the Chairperson of the Board of Directors of the National Revenue Authority.