Johannes Baptista Sumarlin (born in Nglegok, Blitar, East Java, 7 December 1932) is an Indonesian economist and a former Minister of Finance.
Sometimes linked with the so-called Berkeley Mafia group of economic advisers which included senior Indonesian economists such as Widjojo Nitisastro, Emil Salim and Ali Wardhana, Sumarlin held various important economics posts in the Indonesian government for many years until the late 1990s.
He graduated from the Faculty of Economics, University of Indonesia (FEUI) in 1958.
Positions held in government include, among others, Chairman of Supreme Audit Agency, Minister of Finance, Chairman of the National Planning Agency (Bappenas), and Minister for Administrative and Bureaucratic Reform.