Tilak Janaka Marapana PC (born August 1942) is a Sri Lankan lawyer. He was the Minister of Foreign Affairs and Development Assignments. He is a Member of Parliament appointed from the national list and had served as Minister of Law and Order, Prison Reforms from September 2015 to November 2015 and Minister of Defence (2001–2003) and Minister of Transport, Highways and Aviation (2002–2004). As Minister of Defence, he was the only non Presidential or Prime Ministerial holder of the portfolio. A lawyer by profession and a President's Counsel, he had served as a government prosecutor in the Attorney General's Department for twenty six years, serving as Solicitor General and Attorney General.