Tilak Janaka Marapana, MP, PC is a Sri Lankan lawyer. He is a Member of Parliament appointed from the national list. He was a former Cabinet Minister of Law and Order, Prison Reforms serving from September 2015 to November 2015 and was the former Minister of Defence and Minister of Transport, Highways and Aviation. He previously served as the Solicitor General and Attorney General.
Marapana hails from Ratnapura, Sabaragamuwa, he is the second son of former District Judge P. Marapana and has one brother Gamini Marapana, PC. He is an alumnus of S. Thomas' College, Mount Lavinia. He has a degree in Chemistry and Maths as well as a Law Degree.
Marapana joined the Attorney General's Department as a Crown Counsel in 1968. In 1988 he was made a President's Counsel. In 1990 he was appointed Solicitor General and was appointed Attorney General in 1992. He retired as Attorney General in 1994, following the change of the United National Party Government, reverting to the Unofficial Bar.
In 2000 he was appointed as a Member of Parliament from the national list by the UNP. In 2001 he was made Minister of Defence. In 2002 he was made Minister of Transport, Highways and Aviation in addition to the portfolio of Minister of Defence. In 2015, he was reappointed as Member of Parliament from the national list and was appointed as Cabinet Minister of Law and Order, Prison Reforms in September 2015. He resigned from the post in November 2015 following the Avant Garde controversy.