Hedayetullah Al Mamoon is a retired Senior Secretary at the Ministry of Finance of Bangladesh and the chairperson of Janata Bank. Mr. Mamun joined the Bangladesh Civil Service in 1982. He served as the Secretary at the Ministry of Culture, Ministry of Civil Aviation and Tourism, Ministry of Information and the Ministry of Commerce. On 25 February 2018, he was appointed the Chairman of Janata Bank. In 2020, he became the member secretary of the newly launched Association of Former Secretaries. He is member of the governing body of Bangladesh Institute of Governance and Management.